A saying that dirty people made up to say in
normal situations to act as a not-so-
normal situation.
You're probably
confused. Just look at the examples :)
birthday kid: i'll blow all of them at once!
invited
friend: that's what she said
School
Teacher: Stop talking and get back to work, boys
student: that's what she said
Struggling math student: it's so hard T^T
top of the class student: that's what she said