Noun:
The feeling that one who is sleep-deprived gets when finally laying down on a soft surface or resting their head on a pillow. Usually followed by instant sleep.
I was so tired after picking my friend up from the airport at 10 PM that when I finally got to a bed, I had a pillowgasm and instantly fell asleep.
by Starhowl March 30, 2010
The feeling of your head hitting a pillow, after a long, rough day.
Alice had a pillowgasm when she laid her head on her pillow after the long day at work.
by happynap August 15, 2011

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