To pusha joke so far that it stops being funny, only to continue pushing it so that eventually becomes funny again. Functions as both a noun and a verb.
Richard: Why do you suppose that Peter Kay keeps repeating the same material on his live DVDs? It's as though he's incapable of writing fresh material, but such a thing cannot be!
Emma: Perhaps he's attempting to cultivate a cumpkin.
Where a group of people ejaculate in a hollowed out pumpkin and one person has to dunk their head in it for 10 seconds, while the group rubs the pumpkin on the wearers head.
John was pissed after being selected for the cumpkin-dunk, his hair was so sticky after only 10 seconds.
One of the most pleasureable, distgusting, and dangerous forms of vandalism. Smoking crack while simultaneously recieving head, and taking a shit in the top tank of a toilet. The female performing the oral sex is sitting on the bottom part of the toilete backwards, like A.C. Slater, taking a shit.
hey jeff how was that party? it was cool, but someone did a tripple decker a.c. slater crumpkin in my toilet and it smells like hagrid's butt in my house!