whatchamafuckit
A term used to describe something you either don't know the name of, or can't think of the name.
Travis: "Hand me that whatchamafuckit over there."
Whatchamafuckit
The funnier version of whatchamacallit. Often used by aging steel-workers who can’t remember where they left their bull-prick…
Hey motherfucker, hand me that whatchamafuckit right the fuck now!