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To open the mouth wide and take in air deeply, often as in involuntary reaction to tiredness, sleepiness, or boredom (yawn). Accompanied by a remark (sauce) at the state of your boredom and/or how you got there, follwed by the word "Yawnsauce" to signify the end of your statement.
I stayed home from school today and all i did was watch movies. Yawnsauce.
by Shy Ronnie November 29, 2010
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