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A bucket used for defecating while in a truck (or other motor vehicle). For instance, while on a no-stop road trip or while involved in a police chase. See also baby bottle.
Earl: Pull over man, I gotta take a shit.
Jason: No way, the cops are right behind us. Just use the truck bucket.
Earl: Oh, right, I forgot about that.
by nowayman2 January 19, 2011