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Someone who may be intelligent, but who does something classically stupid which would infer that he/she is in actuality unintelligent. Someone who acts negatively and out of character and is reprimanded, in jest, by their peers. Similar to the UK's "wanker", but used more lightly and with humor in Canada.
Cheating on a Hot, Sweet Girlfriend / Climbing Buildings while intoxicated with loafers / Peeing too close to metal in -28 weather / Deciding it's a good time to explore your emotional, feminine side at the Urinals in the Club / Getting Caught with exam answers in micro-print, taped to your HB pencil... Female: Putting Nair on your Eyebrows / Using Dish-detergent in the Clothes Washer / Never Checking the Oil / Video-taping the Stagette / Letting that Hot guy from the Hockey-team video tape slightly-tipsy porn-star-you...

"Wow, 'Johnny'/'Jenny', that was a Dummm Asss thing to do; you are a Dumass!"
dum ass by Jane R. December 15, 2004
to not be smart about something or not make correct decisions
correct spelling dumb
"That girl is dum dude"
dum by heavy_a December 18, 2002

Ba dum tss 

An onomatopoeic sound usually heard after a dad joke
My essay on the Cold War has to be finished tomorrow. I’m really Russian to get finish. *sarcastically* ba dum tss
Ba dum tss by sdmn :) May 15, 2020
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!
Dum by Yermom<3 June 5, 2014
A retarded way of saying "dumb"- emphasis on the B.
"That's dum-b"
"You're dum-b"
dum-b by Chelz and MeL March 30, 2005

dum bass 

dumb ass pronounced by a red neck
shut up, ya big dum bass!
dum bass by feleah August 29, 2003