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1.
yawn fest is an abbreviation of yawn festival. it describes something that you find boring and therefore induces yawning.
"this film is such a yawn fest".
by eddie. b August 30, 2006
 
2.
When everyone starts yawning at the same time.
Dude in english class yesterday, there was a total yawn-fest.
by ozh...ozmaster August 30, 2009