The original bulls balls that hang under the back of a truck, usually a redneck's add-on to remind people that the truck is masculine. Looks like a bulls scrotum. Also as a gag. Driver usually has a redneck horn on his dash too.
Hey man, them aint bumper nuts themz BULLSBALLS!
by jrBman August 26, 2006
The original truck balls or truck nuts are scrotum look-alikes that rednecks hang on the back of their trucks to let people know that they drive a masculine vehical.
What a joke, see them pingpong balls under that truck? Must be a kiddie driving. He should get some REAL bulls balls.
by jrBman August 26, 2006

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