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 wimpy-ass little bitch of a man, who is such a huge cuck, that they would rather build a raft to run away on than confront the guy railing his butt slutlady friend.
Yeah man, I was balls deep in Tony's girlfriend last night when he walked in on us, but he was such a Cuckleberry Finn that he just decided to go to his parents house to jack off instead.