An exclamation used after having thrown something high into the air above a group of people, (Which may or may not include yourself) that would inflict decent pain upon landing if it should hit someone, with the purpose of making said group panic, for your entertainment.
(Joe is holding many large rocks and walks up to a group of people.)
Joe: Hey guys!
(This draws the damn fools' attentions. Joe tosses the rocks high into the air directly above the group of people.)
Joe (simultaneously with throwing the rocks): YAHTZEE!
(The group splits immediately, each former member sprinting in a different direction, all panicking. Joe is pleased by this.)
1. The centerpoint from which the Big Bang released all matter into space, so therefore, the oldest point in space. Some theorize that there is/was either a giant black hole or a giant white hole (the opposite of a black hole; it expels matter instead of sucking it up) at the center of the universe at some time.
1. Yo momma so old, she has baby pictures of the center of the universe.
2. Do you really wanna mess with the CENTER OF THE UNIVERSE?! Hmm?!