Butt cheek buddies are good friends who even though some shit sometimes comes between them, they always come back together.
Friend 1: You know, sometimes you really have your head up your ass.
Friend 2: Yeah, I know. You want another beer, butt cheek buddy?
When your girlfriend cleans or tidies your messy living space without being asked to do so. An act of kindness similar to a hand job or blow job.
Friend 1: Man, you're place looks sweet. What's up, is your mother coming over?
Friend 2: Nah, Angel gave me a house job.
Friend 1: Wow, she's a keeper, man.