Going all in with a lousy hand just to end the poker night.
"He went in with a 7/2?"
"Yeah, it was poker suicide, he has to work in the morning."
Any situation or person that would end an erection quickly. Picturing your grandmother naked is the original bone melter.
Man 1: "That girl is so ugly she could make a strap-on go limp"
Man 2: "Yeah, she's a real bone melter"