$j = Get-AzureRmResourceGroup | ? {
    $_.ResourceGroupName -like "hogehoge*"
} | % {
    Start-Job {
        param ($c, $n) Remove-AzureRmResourceGroup -AzureRmContext $c -ResourceGroupName $n -Verbose -Confirm:$false -Force
    } -ArgumentList (Get-AzureRmContext), $_.ResourceGroupName
}
$j | Receive-Job -AutoRemoveJob -Wait -WriteJobInResults