With no clear single source attached to it, Sleazy has spread mainly as a short reaction clip passed around on soundboards and in editing communities. Creators use it as shorthand for behaviour that feels greasy, opportunistic or a bit too smooth, so the audience gets the characterisation in seconds. It works across memes, gaming edits and short form video because the meaning is obvious without any setup. That simplicity keeps it in circulation, as one well timed drop can turn a normal interaction into a joke about bad intentions.