bart: the burgular even stole my stamp collection lisa: you had a stamp collection?? (rest of family laughs)  (phone rings) nelson: stamp collection? haha
used by nelson in the simpsons in many of circumstances
"bart: the burgular even stole my stamp collection lisa: you had a stamp collection?? (rest of family laughs)  (phone rings) nelson: stamp collection? haha" What is the definition of "haha"?