A term used in the counter strike movement community to describe a player surfing on the absolute edge of a model. Similiarly to a jumpbug, it denies fall damage and doesn't generate a landing sound effect. In fragmovies it can add style to a kill. Cheats like millionware.vip offer an "edgebug assist" feature, other cheats can only do such with the use of a lua script.
"yo i jumpbugged cat to chair legit AND hit an edgebug after, how dope am i?"
it's in the name, you surf or slide off edges in source games, usually in CS:GO (counter-strike global offensive) which is obviously a bug, movement players/cheaters hit edgebugs, along with routes, for clips or demo making.