Thats What I Thought!
1- Another way of saying , yeah i thought so
2- Meaning, Yeah Shut all that Krap(Shi*) up
3- also saying yeah, shut up
jessie heard about a fight and tells Kayla. Kayla knows what actually happend and tries to tell jessie what went down.

Jessie- No im right !
Kayle- No, because i was standing right there wactching it happen
Jessie- Ooo.
Kayla- Yeah "Thats What I Thought!"
Jessie - O shut up lol