when you go into shock because your teacher said something totally not school apropriate. AND they get it.
"I can't believe my apush teacher just said a "thats what she said joke" , I'm in disbefuckinlief!"
A Ratty poo is a dog that has a large body and small head typically a chihuahua. The word ratty comes from the resemblance of a rat. The word poo comes from the love we carry in our hearts for them.
"come here my little ratty poo"
(dog should run up to you and give affection)