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An exclamatory word shouted when an exciting event is about to, or has just occurred. Best when yelled in large groups of people, preferably strangers, in hopes they will shout it back for fun.
(In the middle of Spanish class)
Joe: "Bro I lost my virginity last night!"
Adam: "HASSAW!"
Brittany: "Hassaw!?"
Mrs. James: "HASSSSSAW! ...Now back to class."
by Hassawbeech July 21, 2012