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1.
a pint of Ben & Jerry's ice cream which is a nutritional staple of nearly all wubas, or dubs, at the united states naval academy.
The wuba stood there, infatuated by the variety of dub tubs. Her only regret was that there wasn't a spoon big enough to eat them all.
by 4/C Philo McGiffen August 29, 2007
 
2.
a convertible Volkswagen, stems from the slang name for VW 'V-Dub' and the Kubelwagen (VW WW2 vehicle meaning 'tub car') which was the predecessor to the VW Thing.
Kelly: It rained and I forgot to put the top up.
Brian: Don't sweat it love, it's a dub tub.
by Some Money King November 25, 2009