A Hand soap wack is the act of using hand soap instead of lotion to finish a beating session because you ran out of lotion.
Genghis Khan: fuck hitler do you have any more lotion.
Hitler: Have you ever been using a fuck ton of lotion and you run out and canât finish dry because your too much of a bitch.
Genghis Khan: yeah Iâm being one right now.
Hitler: well do the hand soap wack to finish that jack.
Genghis Khan: Hitler this why you killed yourself.