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when some thing is hella dumb, it means over the top STUPID
Paris Hilton said: does wal-mart sell walls.

OMG! that was "hella dumb"
by wordsayword May 07, 2008
hella loosely translates to 'very' (also can be 'extremely'). Helladumb translates loosely to 'very dumb' or 'extremely dumb'
The website you suggested was helladumb!
by HDPirate34 June 12, 2007