-If you were hanging out with a friend and left to hang with "cooler" kids, you were a flat leaver
-If person A hangs out with person B & C, and then person A leaves to hang out with person D & E, then person A is a Flat Leaver...
::Enter person D & E::
Person D & E: Hello person A, come hang out with us
::Person A leaves person B & C to hang out with person D & E::
Person B & C: You're a Flat Leaver person A...
Guys: Oh!, We don't know. Maybe catch a flick or something. What do you want to do?
Ed: I dunno, but that sounds good. Oh look, check out Kiki and her friends.
Ed: Later y'll I'm out!
Ed is classified as a flatleaver!
B: A flat is an apartment in other parts of the world. Therefore. A Flatleaver is someone who is in a flat and exits said flat.
-If you are playing a game, lets say, ping pong, with your girl and you ditch her to play with "the guys", and you don't come back later to play with her, you are a "flat leaver".