"i just took a penis in my butt" is a part of the J.cole middle child parody, or as people call it "sus remix" but it could also be used in multiple other context's
Mike; Hey Joe!
Joe; Ye?
Mike; I can bend my penis in my butt
Joe; Huuhhhhhhhhhhh!!!!!!!!!!
Mike; Ya, its like I'm getting fucked by my self
Joe; ...
Mike; You like :)
Joe; Get away from me