The phenomenon of the pelvic area suddenly becoming it's own being and thrusting towards an extremely hot person.
Friend 1- Dude, look at that guy, he's SO hot!
Friend 2- I know! Uh oh, I think I'm getting the Pelvic Thrust Syndrome!
Friend 1- Oh no! Restrain yourself!
Friend 2- It's too late! HELP!
The act of putting ice cubes in that box then putting your dick in.
Marla wanted to get kinky last night so I convinced her to let me put my beef in the freezer.