Most melee terms are either really self explanatory, or built upon already existed terms in other fighting games, such as wavedashing and everything that builds out of that. There are a lot of silly names like hax dashing that get used sometimes, but most people would just say wavelanding backwards off the ledge instead of saying hax dashing. Most of the silly AT names are from the early times of brawl when everyone and his mother would find something even slightly out of the ordinary and instantly give it a name, often renaming old techs and such.
I fear for any new cool techs found in the beginning of smash 4.