A Kabobulator is an object which its name is unknown, or not immediately remembered. It is synonymous with thingamabob and whatjamacallit.
Sam: There we were, smoking our shit when all of a sudden, this freaking huge kabobulator fell from the sky!
Sam: Yeah you know, one of those thingsamabobs with stuff and shit.
Jess: Oh, you mean an aeroplane?
Sam: Thats what I'm talking about!