Masturbating to the point of exhaustion
Friend: Hey! Want to hang out? You: I would, but I am exhausterbated
When you just can't get to sleep, and counting sheep for the umpteenth time ain't cuttin' it...
"My gosh, it's midnight! If I'm going to get up for that 6:30 tee-off, I've got to get to sleep...time to EXHAUSTERBATE!