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noun - Person (can be either sex, but more commonly used to describe a woman) who contracts a venereal disease and infects their subsequent sexual partners.

Comes from the historical naval warfare practice of lighting an old ship on fire and letting it drift into your enemy's formation to burn all of his ships.
"I think that chick with the great rack is really into me."

"Don't do it, man. I heard she's a fire ship."
by Gorillajoe April 10, 2007
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The vengeful act of crapping on a lover's chest while they sleep.

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Bewared lads, that there lass is a fireship!
by TheCheezCake February 19, 2009
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