Euphemism for a female’s shaven labia, especially if the labia are full and plump thereby resembling a small pair of butt cheeks.
The opposite of "meat curtains" where the labia are distended or are saggy and floppy or stretched out.
Said to a nude female dancer, "Show me that mini butt! Shake your mini butt!"
Used as reference to yourself (female), "After shaving, my mini butt was so firm and smooth."
As a description, "That girl's mini butt was so tight, not like the meat curtains on my ex!"