Its Don't put your dick in a vise. Meaning don't do something that is going to require great sacrifice if you can't get out of said situation. So like the joke goes. The husband bust into the bedroom catching his best friend ducking his wife! The husband grabs his buddy by the balls and drags him outside to the garage and puts his dick in a vise and breaks off the handle. The husband then pulls out a knife and thats when his buddy scream; "Oh God your not gonna cut my dick off are ya?!" To which the husband replies, "No you are, I'm lighting the garage on fire!!'