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(verb.) When one's titties pop out of one's shirt, bra, or swim suit top unexpectedly revealing nipple and all. All witnesses are quite pleased in this situation.

(adj.) describes a situation or event that is so completely bitchin and astonishing that it renders one incapable of completing sentences. It is all that can be uttered.
Ted: "That was the best pizza I've ever put in my mouth."
Bill: "Dude, titty explosion."
by JAMITIN69 April 13, 2011
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