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Usually referring to when someone wants to be random, but just ends up looking really, really stupid.
Jorge : I LET THE DOGS OUT! CHEESE + MAYO = MORTGAGE! OLOLO
Hernandez : Dude, you're totally randumb, stop trying.
Randumb by CriticalDesign January 16, 2008
"He probably thinks it's funny when he breaks into the 'berries and cream' dance, but everyone else thinks it's so randumb.
randumb by Evelynne December 29, 2007
something that is both random and dumb at the same time
guy1: GALLIUM IS AN ELEPHANT!
guy2: no, it's an element. that was randumb.
Randumb by Bcikablam October 25, 2018
When something or someone is so random, Its DUMB
Mike: I went to the store this weekend and went up to the cashier and went "You suck a duck", It was so random it was funny

Jon: Thats not random......thats just ranDUMB
ranDUMB by Kurt Jurgens January 1, 2009
someone who is unknown, and they want to be notoriously well known.
ex1. Kid no one knows who are you are your such a randumb.

ex2. These guys are a bunch of randumbs
randumb by hasselhoffman February 26, 2009
If someone says theyre random, you go "No, ur ranDUMB!"

HAHAHAHA SO FUNNY n00bz0r
I R RANDOMEST UV ALL j00 NUBS!

You mean randumbest?

Everyone - OHHHHHH PWND!
randumb by pwnz0r September 19, 2003