So get ya knees flexin’ and your arms T-rexin’
Do the creep (haaaa)
And do the creep (haaa)

from The Lonely Island (Ft. Nicki Minaj) – The Creep Lyrics on Rap Genius

Meaning

T-Rexes had tiny-ass arms. Creepy white boys who don’t know how to dance can be found holding their arms in weird-ass positions that look kind of like this:

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