reeheehee

Usually you hear this noise by the autistic kids in the back of the class, or it could just be some sound that one of your friends think is funny.. (originated from Scooby-Doo and is just a wierd noise)

Ex1:
Teacher: Jonny what's the answer to nu-
Jonny: REEHEHEHEEEEEHHEHEHEHEHEE

Ex2:
Person 1: Hey bud
Person 2: Reeheehee