A single turd so long that, when sitting in the bottom of the toilet, it appears as a mythical sea serpeant sticking its head out of the water.
"I was so constipated the last few days, I finally birthed this huge seamonster."
by ColonGrl September 10, 2009
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A person who plays Counter-Strike and is loved by not too many.

Brother of Conifist
Hey, Seamonster, how come you get so many HS?
by Seamonster May 3, 2004
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1. Form of sexual deviancy in which one of the male gender encounters an attractive female on the street during a rainy night, throws her down in a puddle, and rapes her. This is generally frowned upon by anyone residing north of the mason-dixon line. Elsewhere, however, not so much.
2. My dick
1. I was walking home from work the other night when I seamonstered this chick. She totally wanted it.
2. When she caught up with me afterward, she butchered my seamonster. Go figure.
by codgermayne May 5, 2009
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A ridicuously massive shlong. Must be at least 7 inches flacid
Did you hear about that kid on the hockey team?
Yeah, i heard his seamonster was 10 inches flacid
by Mushroom Mike April 6, 2011
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