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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
Related Words
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

pattywampus 

adj. usually used to describe women of a crazy, loose or unpredictable nature
After I fucked her in the ass, that bitch got all pattywampus on me.
pattywampus by donnyJohnny May 10, 2011

Patiogasm 

Feelings of physical contentment, palpitations & throbbing of the genitalia, tingling of toes and lips, giggling while On The Patio.
Capable of mutiple patiogasms.
Patiogasm by M Carpenter October 24, 2004
When one purposely creates a large gap between their two front teeth in order to smoke snausage without opening the mouth.
Man, look at that sweet pattygap. It's the perfect size for my hoag!
Pattygap by Wassertits April 29, 2009

Pantsgasm 

Having just orgasmed inside your pants, involuntarily.
John said, "Dude, this cheeseburger gave me a pantsgasm."