When you use mustard as lube because there's nothing else and her snatch is as dry as the desert.
Steve: Bro how'd it go last night with Kim? Bob: It was ok till I ran out of lube and her baby maker was so dry I could soak El Niño with it, and had to musterfuck her.
Steve: Oh you musterfucked her? You nasty as hell.
Some motherfucker who is a modder who does game modifications in copyrighted games, and the law is against videogame moding, because it goes against fair use and still is impune to such outlawed action.
Modder: heheh modding iz cool, dude, ecksdee
Random: Why are you doing mods for coyrighted games? It's illegal! You're such a modderfucker...