An average family made of Eddie Murphy in drag, young Jim Carrey, and the fat kid from The Goonies are... well, alive. All is well for about 20 minutes, we see the kid going on about his day, school, prom, eating at mcdonalds, Jim Carrey is making important business calls and shaking important hands, and Eddie Murphy is prancing about in Hawaiian dresses (kind of like Hawaiian shirts, except... dresses...) Weird Al Yankovic would call too loud.
Introduction stage is over and we move onto the conflict.
The kid gets stricken (struck?) with horrid constipation. Seriously horrid constipation. It starts small, he can shit a little at first, but then his sphincter fails, so he can't shit anymore.
The parents try everything, resulting to increasingly violent solutions, yet nothing works. Not permanently.
Eddie Murphy can be seen fainting like a 1940's damsel here and there. His dresses also get progressively puffier and puffier.
At some point he gets stuck in a door and gets rescued by Taco Bell's CEO.
Towards the end we realize nothing works. The kid is now in chemo, hooked to various machines and is wearing enough needles to accurately cosplay a hedgehog.
The Make A Wish foundation senses the kid's last days are coming and makes its way to his room to offer him all the glory the world has to offer, but the kid is humble... ish... he wants to share a taco with Taco Bell's CEO and thank him for rescuing his mother.
Taco Bell's CEO (Uh... let's go with Will Smith in whiteface - the opposite of blackface. I'm not sure how that'd work out, but it's MY movie, goddammit! That's what costume design department is for!) is revealed to be a Grumpy Old White Guy (TM), but eventually has a change of heart when Eddie Murphy is seen on her knees and hands, prostrating and begging to give the kid five minutes and a taco.
Will Smith reluctantly agrees. He is shown to be also throwing important calls around, screaming about the importance of tacos at 20-25 year old millenials and being a dick all around. His phone rings, it's the Make A Wish foundation, they remind him of his meeting with the kid, he sighs, climbs into his taco shaped limo and grunts at the driver.
He arrives at the hospital surrounded by body guards and Tommy Lee Jones wearing a taco costume. Mr Jones has fallen on hard times and this is a better gig than prostitution. He looks like he's about to deepthroat a shotgun.
The nurses lead Taco Bell CEO to the kids room. He enters, sits down on his bed and Mr Jones delivers a sparkling taco.
This, Will Smith, explains, is a prototype taco. The best taco in the universe, and he brought it to the kid to try out. He shoos Mr Jones away. Mr Jones sighs, exits the room and closes the door as he walks out. After a few seconds there are sounds of struggle followed by a single gun shot and people screaming. A bit of blood comes in from under the door.
The kid is about to take a bite, but Will Smith stops him. He takes off what turns out to be a wig, his belt and pulls a zipper on his back, revealing he is, in fact, Arden Cho, a magical taco fairy that came to his aid and this is her special anti-constipation taco. She's also stark naked because reasons.
The kid can choose the eat the taco and enjoy the best damn taco in the world, or he can use it to cure all disease and bring peace onto the world by declaring the holy prayer: zoop-dee-doop! I want to poop!
There's a brief shot of various ghetto neighborhoods around the world and some muggings.
Now the kid is conflicted - here in his hands is the best damn taco to ever be. Period. He can eat it and experience nirvana, or he can use it as sacrifice to bring peace upon the ENTIRE EARTH!
The kid eventually agrees to sacrifice the taco.
"Zoop-dee-doop", he whispers with tears in his eyes, "I! WANT! TO! POOP!"
That one he screams at the top of his lungs.
The taco dissipates into thin air. The blood retracts back into Mr Jones' body, a shot of senior citizens suddenly turning young and poor neighborhoods suddenly receiving much governmental attention plays out.
Doctors rush in to see what this commotion is about and are greeted with the kid going SSJ, successfully shitting out (implied) a soccer-ball-sized item that forms a hole in the wall as it flies out of his ass, doing at least Mach 3, followed by a comic "toot".
In the end the "kid" is seen about 20 years later, he has a family, kids, fuckloads of money, and Tommy Lee Jones as his assistant, promoted from his embarrassing previous position.
Fin.