To be in "cock mode" is when men decide to give their brains a rest and let their penises take over. Cock mode is not a sensible way to operate on a night out. It will lead the unfortunate male into a diseased or unattractive female.

A guy ceases to run in cock mode within 3 minutes of ejaculating- usually when cognitive thought returns and the hideous beast they have just lain with comes into full focus.

Cock mode can be a good thing if you're in a long term relationship with a girl who does your head in. Switch off your brain and let your penis listen to the inane chatter instead, and then secure a nice orgasm for you. Sorted.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.