laughathon means something very funny; a comedy session or period of great amusement. Lexicurio rates it Sui generis — a strength score of 86 out of 100.
Etymology
From laugh + -athon.
noun
- Something very funny; a comedy session or period of great amusement.“Oh, I had a jolly time in South Dakota, all right, a regular laughathon of nonstop fun and entertainment”