On (his) dick...
1. When you continously laugh at someone's jokes to fit in and or afraid of the jokes being transferred towards you...

2. Common intro in convosations... Lmao, lol, hahaha, facts, etc.

3. Doesn't have to necessarily have to understand the joke... (Just inputs laughter)

4. Never a funny joke when about oneself or nationality
Colin: Lmao

Anonymous: Why you on (his) dick... ? Shit wasn't even funny.

Hooded Kermit "you did good... Now scroll up and see whats funny"