'Oompa loompa lookin ahh' is a term used to associate a person with an 'oompa loompa' a homosexual figure from Willy Wonka that was used as his 'candy pickers'. It is also to associate a person with down syndrome and autism at the same time.
"You goofy ass hoe who you talking to like that ya oompa loompa lookin ahhhhh"
When someone tends to stand out in the crowd. Usually not in a good way.
Man. You can literally see Tyler’s fucking forehead over this crowd. The tallest oompa loompa right there I think.