To be full of one's self. To have one's head(ego) so large that it can not be extracted from one's ass.
Person A: I just fucked Paris Hilton and Hennifer Lopez at the same time. I made them orgasmlike 10 times each. And then I drove off in the Ferrari that my billionaire uncle gave me for my birthday.
Person B: Dude, you just csulled. Quit csulling you csulling csull.