Messer

Irish slang for a person who jokes around a lot. Often used by parents to their kids, or between friends. Non-derogatory, usually said in good humour.

Child plays prank on parents:
Dad: "oh you're an awful messer."

Person 1: " Did you hear John went down the Main Street in a shopping trolley last night for the craic?"
Person 2: *Laughing* "He's some messer!"