When you're shaking hands with your best friend and it gets out of hand. You work yourself up into a frenzy until you come.
"Oh man, Kelly Brook is so hot, I need to knock one out ... ah ah ah ah ah AH AH AH AHAHAHAHAHAHAHAHAHA oh my god my dick is bleeding! Ah AH AH AH AH AH AHHHHHHHHHHH! Time to chalk another one up for the ole frenzy."