Verb. To laugh so hard that a person does one or more physical gestures that signal the person is laughing too hard and their body responds. Also known in slang as LMFAO, ROFL, and LOL. Resulting in either falling to the ground and rolling on the floor, tearing up, eye spasms, shortness of breath,
flushed face, the inability to speak because of the laughter, continuing a laugh when there is no air left in the lungs to support it (Appears as if they are having small dry heaves), slow movements, and general immobility and lack of quick response time to any outside variable.
"Dude. Ben had a Laughtergasm yesterday and couldn't get up off the floor for a good fifteen minutes!"
"Stop telling those Dead-Baby jokes or I think i'll have a Laughtergasm!"