A person whose lips look like a pair of butt cheeks turned sideways.
That girl has so much lip gloss on, her lips look like a pair of greasy horizontal butt cheeks. She has the biggest booty lips I've ever seen.
booty lips is when you are receiving too much anal sex and the rubbery part of your anus hole pops out and puckers at you, resembling a pair of smooching lips.
nigga you gots da booty lips again.