n: a person who is an easy laugh. A laugh whore will typically laugh at all of your jokes just to gain acceptance from you. You don't mind it because it makes you feel better about yourself. Usually has a mildly obnoxious laugh to go along with his/her hair trigger laugh reflex.

Friend 1: Oh man, we had so much fun! It was just awesome!!
Friend 2: Nah man don't fall for it...she's a total laugh whore.

Friend 1: Yeah so then I said, 'because the frog was stapled to the chicken!'
Friend 2: Hahahahahahahahahahahahah ahahahahahahahahahahahaha hahahahahahahahahahahahah a!!
Friend 1: Yeah I made that one up myself!!

Response when the price is not right (too low).

"Blow you for free?" said the laugh whore, "I don't think so!!!"

n, someone with an overwhelming desire to be funny, i.e. they feed on laughter.

Mario Cantone calls himself a laugh whore.