Used for when a very disappointing moment occurs.

In spots, video games... or anywhere really.
Oh man we lost the hockey game in overtime after being up by three goals in regulation.... that's deflating.
by Tyler McGee December 14, 2008
when you smoke so much pot all you want to do is fall asleep.
guy 1: god dammit, we shouldn't have smoked those seven bowls, i'm deflating.

guy 2: i'm gonna go home and go to sleep.
by tricks355 July 19, 2010

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