a funny group of words that you put on to another sentence to make it sound funny. this "suffix" as you may call it leaves many people dieing of laughter. it is refferring to a girl that you supposedly had sex with and it is implying that she said a certain thing while having sexual intercorse.
boy:(jumping on air bed
his friend:be careful or you'll pop it!
boy: THATS WHAT SHE SAID!!!
innocent girl(who has iphone)(playing with 8125) i dont like yours its to big!
boy: thats what she said