1. When someone steals your joke you made earlier.
2. When a person generally steals one's jokes, he/she is classified as a joke stealer and an Attention Hog.
After one steals another's jokes, the original joke maker may become a ZB and put a ZB hat on to ignore everyone/everything.
1. "Dude, you just stole my joke, what the fuck?"
2. "You fucking douche, you are such a joke stealer!"