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the opposite of a smart car. Reallly big, not very environmentally friendly, and makes a loud, retarded honking noise.
"Quick kids, get in the bomb shelter. Here comes the dum kar"

dum brick 

damn muhfuckaaaaa, iss dum brick outside, goddamn! my muhfuckin skin is crawlin yooo.
dum brick by Matt Sutch January 1, 2008

Dum-Meeeeeeh! 

The ultimate idiot. Not only used when someone does something ultimately retarted, but also when you can't stop shaking your head and uttering "meh" as in, this dumb @$^ fool!
Jenni: <breaks out in a stride into a building with no electricity>
Vickie: You dumb *&% , aint no power n dere plus it"s hott! DUM-MEEEEEEH!
Dum-Meeeeeeh! by VickieD August 5, 2008

Bah Dum Chi 

The act of saying a drum beats and cymbal crash (while doing actions) showing something is either funny or very bad (sarcasm)
Friend: Hey, guess what? Tony gave me his number but he ignores me.

You: Bah dum chi
Bah Dum Chi by ShabbaxD January 17, 2011
The after effect you experience following a extremely intense orgasm or multiple ones. " cum drunk" twist into dum crunk, cant even function properly!
Bob fucked me soooo good I'm dum crunk & dyslexic !!
dum crunk by Giggity guts May 30, 2016
The act of thrusting a DUMDUM lollypop into a pussy. (I think it works with cats too.)
OMG! Last night my BF gave me a Dum-Pum! It was so great!
Dum-Pum by DarkestTrack27 November 7, 2016