gluteus-minimus
Just a very small butt.
guy: "I think I need ass implants, my butt cheeks are so small it hurts to sit down!"
girl: "Don't get implants, I love your gluteus-minimus!"
girl: "Don't get implants, I love your gluteus-minimus!"
Gluteus Minimus
As opposed to gluteus maximus which is the maximum of area a butt takes up. Normally so big when they site down their butt looks like a couch. With gluteus minimus it refers to small scrumptious butt on a hot chick. The butt takes up the minimum amount of area.
That gluteus minimus fits through the door.