something REALLY funny

A object, event or series of words that contains high traces of hilarity, although this is occasionally used as sarcasm

Example 1:

person 1: <a funny sentence>
person 2: that's something REALLY funny

Example 2 (sarcasm):

person 1: <a stupid joke>
person 2: that's something REALLY funny

by Peter B-B May 1, 2008