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A sudden rush of childhood or fond memories that strikes you almost instantaneously and puts in a nostalgic relaxant state for a random period of time.

Pastgasms can occur when watching media from your childhood or youth, playing a game or activity with someone you've known for a long time, or even when you think of one or more nostalgic moments that link together into a web of memories.

The word pastgasm originated from an internet conversation with a user named SkillZombie. He and the other user were watching videos of old shows on Youtube that they had believed they had forgotten about. When one particular show had been viewed by the pair, SkillZombie had said "Whoa, I think I just pastgasmed."

The amount of time an individual is affected by a pastgasm depends on how deeply rooted or cherished the memory is by the individual. If they have a pastgasm that was triggered by the memory of a good day they had, it may only last a few seconds. If they have a pastgasm that was triggered by a memory that was a staple in their childhood or past, it may last for at least a few minutes.
1. After seeing an entire DVD of "Thundercats", Josh pastgasmed for the next few seconds.

2. During a game of manhunt, Jasmine was caught because a pastgasm she had from remembering the game froze her in her place momentarily so she couldn't escape.
Pastgasm by SkillZombie September 11, 2009
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To come in your pants when aroused either sexually or emotionally.
I just saw Halle berry on the beach and had a total pantgasm.
pantgasm by wyzenguard May 4, 2012
Related Words

Postgasmic

The state a guy often goes into after shagging a girl that he has little or no connection with - lethargy, loss of interest, noncommunicative
Typically used derisively by girls when they realise that they have just been used and that the guy isn't actually interested in them.
Girl: do you know you are always so much more fun before you come

Boy: leave me alone, I feel tired

Girl: Pff, you're just postgasmic
Postgasmic by William0991 May 12, 2016

postgasm 

when a person on a social networking site updates numerous times in a short period.
Friend 1: Man, did you see all his posts on Facebook last night?

Friend 2: Ya, he definitely just had a postgasm..
postgasm by jonniesask December 1, 2011
Your dry pussy becoming a wet pussy whenever you hear Patrick Starrs sexy hoarse raspy voice.
I invited Gillian over to watch Spongebob Squarepants and she Patgasm-ed all over the couch. It was messy.
Patgasm by bogosuperelf April 16, 2021