A tractor trailer, or set of trailers that hauls sand or gravel and dumps via neumatic gates underneath.  Bottom dumps are usualy driven by the dumbest truck drivers a company can find (i.e. niggers, ragheads, tooth-less okies and mexicans.)
by Transfer Matt November 11, 2006
 Get the bottom dumpmug.
Get the bottom dumpmug. by Jollyestrancgers July 21, 2022
 Get the Bottom-Dumpmug.
Get the Bottom-Dumpmug.