(noun) A liquid drink served at the Phi Psi lodge at Cornell University especially during the 1970s. Used as a substitute for other decent drinks in order to save money for the house. Gunder was akin to Kool-aid, but somewhat thicker. It did not come in flavors, so much as it came in colors of which there were primarily two -- green and red.
The Brow's skin tone was the color of green gunder. Red cake goes well with a big glass of green gunder. My blood flows with green gunder.
by B.J. Cleaver December 13, 2004
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gay looking male (usually briefs) underwear, often containing pastel colors, obnoxious patterns, or rainbow stripes.

Cross between 'gay' and 'underwear'
1) I'd like to return this as I thought there would be 3 pairs of simple, solid color briefs, but I was shocked to find this pastel striped gunder hidden between the two pairs on the outside.

2) Man: Lemme flip the lights before we go any further.

Woman: why? are you wearing gunders?
by no one in particular really August 9, 2009
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A term born from the anime 'Nichijou'. It is the combination of 'gun' and 'tsundere' to make 'gundere'. It is the same as tsundere but the cold-like treatment towards the love victim is taken to a new level, incorporating the use of weapons ranging from sub-machine guns to heavy artillery.
The cold-treatment in 'tsundere' is usually just verbal, where as in 'gundere' the cold-treatment is extreme violence via heavy weaponry.

Female (blushing): I-It's not like I'm doing this for you or anything.
Male: I don't really need your help..
Female (extreme blushing): *Fires rocket launcher at the male* I'm going to help you anyway! be grateful!
by Keodara January 12, 2012
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A phrase describing someone who frequently goes out without any form of payment with them.

i.e. Forgetting your wallet
"Matt went to the bar Gunder Style last night"

"Man that bar tab cost me a fortune because Chris went out Gunder Style"
by PViddy December 20, 2012
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the sweat and nastiness that is formed under the gut a over weight person
you got a gunder sauce stain on your pants
by j-remy November 12, 2007
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To be trapped alone in a meeting with multiple bosses, supervisors or coworkers.
As soon as I turned in my status report I was mergle-gunder-salamanated.
by netteach March 14, 2003
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