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Anything that is both yum and yuk at the same time.
That sushi is totally yumk, it tastes yuk but looks yum. That guy is yumk, he looks good but smells bad, or vice versa.
by Laffing Bear January 18, 2013
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That feeling you get when you eat or smell too muck of a good thing and it makes you sick. Too much of a good thing.
At the end of eating a tube of raw cookie dough...yumk.

That lemon scent sprayed at the car wash if you don't open the windows, yumk.
by Flipweed April 26, 2013
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