Top definition
A texting/IMing abbreviation for "are you kidding me?"

When said out loud, it is pronounced roo-kum.
Alex: So I started going out with Laura.

Joey: RUKM?! I thought you hated her!

-or-

Martin: I got a 58 on my math test?! RUKM! I studied all night for that!
by mrwaters_algebra_period2 October 30, 2009
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2
A word standing for "Are you kidding me?"- an expression commonly used by people to express their exasperation during an OMG type situation.
Kona Grill no longer has reverse happy hour, RUKM!
by Crumbs. October 06, 2010
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