look up any word, like b4nny:
 
1.
When someone steals your joke and uses it to get their own laughs.
(Thurs)

Lisa: "Man, Tracy Jordan is so stupid-smart!....I just made that up!"

(Fri)

John: "I've been using stupid-smart all day, and BTW, I just submitted it to the Urban Dictionary!"

Lisa: "WTF?! You totally laugh-jacked me!"
by dubble-dee March 31, 2011