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1. An exclamation of delight to mark the commencement of festivities.
2. An invocation meant to solicit mischief and merriment.
Example sentence using yiip: "yyyyyyyyiiiiiiipppppppp!!!!"
by Brad Cameron January 06, 2006
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2
a word yelled on long weekends randomly for the enjoyment of others
yiip!!! yiip!! (usually in somebodies ear)
by mike graham June 19, 2005
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