A word that just rolls out of your mouth when you're extremly pissed and try calling someone a cocksucker but by the time you're half-way into the word your anger has escalated so much that all you wanna say is 'fuck'.

Also can happen if you've been using 'fuck' so many times that your brain doesn't have the time to override 'fuck' with the next syllable of the word you're trying to say.

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