Verb. The point of Ecstasy reached by one or both geriatric lovers when engaging in coitus. With or without the help of viagra or farm equipment.
"Tommy walked in on his grandpa balls deep in his grandma. They were in the throws of one sweaty oldgasm."
by Tonker, lord of the chode March 7, 2009
The orgasm-like groan an old person emits almost every time they try to move, like when standing up out of a chair.
Grandpa's loud oldgasm startled his dog, which almost tripped him when he was trying to get off the couch to get another beer.
by helnwls June 23, 2016