When you start to jack a dude off, and before he cums you stop and leave. This is a more vindictive form of a cock tease
A well meaning, but intoxicated Trixie takes Chad home from the bar. Things start to get nasty. She puts her hand down his pants and starts to jerk him off. Something causes her to stop, either revenge or her conscience, and she walks away. He says, "It's not cool to pump fake me like that."