Possibly the worst ironic word in the intire internet type. A shortenend version of the usually/possibly insulting word ' dumb ', which originally means 'unable to talk', but in todays language, means just plain stupid.
Umm...Umm. I think you are dum maaan, you can't even spell dum right- dum ass!
by D Mob January 23, 2005
to not be smart about something or not make correct decisions
correct spelling dumb
"That girl is dum dude"
by heavy_a December 18, 2002
1. A common misspelling of dumb.
2. Or another word for dry cum
1. Dude: Man your so dum!

Man: dude your spelling skills suck!

2.Aw sh*t, got a bunch of dum from last night on my pants!
by Yermom<3 June 05, 2014
extreme form of the word "dum", because the dum rarely get a 'b'.
Lifeless student 1: Did you that Jennifer's chemistry average is a 34?
Lifeless student 2: Unsurprising. She's so dum.
by popegrandpoobah December 01, 2011
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