Something dirty that a female might say during sex
Example 1: after larry let the pizza lay out and it became stale.
billy: arrrgh its so hard
Johnny: Thats what she said
Example 2: Joe and Trenton were eating ice cream.
Joe: mmmmm this tastes sooo good
Trenton: Thats what she said
Example 3: Jack and Nick Were at a party last night.
Jack: last night was the best, it was so fun.
Nick: thats what she said
Example 4: Adam and Tyler were waiting in a line that was hardly moving at all.
Adam: Thats what she said