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A person that talks shit about how great they are at something, and how they will dominate all comers. In reality they stink and will most likely come in 4th place
Ashley had been talking smack all night about her scrabble skills until she came in last. Bob called her a doomisine
by Wil Rubes October 01, 2007
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Words related to doomisine

bloviate count chocula loser lost rhotumbus