The act of getting a haircut, where one only trims a microscopic amount. To be considered a micro trim, one must not have to sweep the floor when the haircut is finished. Usually used when growing one's hair out.
Lindsey: Yes, I'd like a haircut please!
Jaime: Alright, mam, how would you like your hair cut?
Lindsey: I'd like a micro trim!
Jaime: What the hell is a micro trim?
Lindsey: I want you to trim a microscopic amount from my hair. There should only be dust on the floor. Kay? Thanks!