(verb) To have sex with one's butt crack. Similar to titty fucking, but with ass meat instead. Great option when hooking up with a girl with no tits but a fat ass. see also: creased, creasy, creaser, creasing.
She didn't want to have sex so I asked her if I could crease.
Any local muscular MMA-wannabe type guy who has manicured fingers, pencil-thin tweezed eyebrows, and $75 haircuts. Some even wear makeup. They usually have the Hawaiian islands tattooed somewhere, like to mean mug and throw up middle fingers in photos, and have the IQ of an average rock.
What's up with all the ripped gay dudes? Nah, brah they're not gay, they're just metromokes.