A euphemism for gay sex with demonstrably larger men
He went swimming with the manatees last weekend
by SpillyMcDeez March 1, 2016
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A fat girl (evil manatees for plural) that seems like she’d be friendly or at least tolerable to be in the same room as but turns out to be a hostile, rude, unpleasant person for no apparent reason. Also known as a fat bitch, PMS blimp, whale of bad attitude, Disrespectius Vitellius, Miss Piggy having a grumpy day
I thought I was going to make some friends when I saw girls as fat as me laughing and joking around.. but they turned out to be evil manatees.
by lil miss missfit May 23, 2008
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When someone possess negative traits to such an extreme that the person appears to exhibit the opposite positive trait.

Similar to how a manatee is so ugly that it is perhaps the most beautiful creature on Earth.
Guy 1: Dude, she's pretty cute.

Guy 2: What are you talking about, she looks like a man, and not a good lookin' one at that.

Guy 1: Oh... I guess you're right, the manatee effect had me going there for a second.
by SMSchoirboy October 8, 2011
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A giant turd that is the size of a sea cow (manatee)
Holmes went in the crapper and dropped a butt manatee. That loaf was so huge I had to break it up with a stick before it would go down. What a sack slapper.
by Harold Paratestes May 21, 2007
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A website accidentally created by Conan O'Brian that shows fake manatee porn with a person in a manatee mascot outfit, types of "porn" include, Man on Mantee, ManaTeen, Shaved Manatee, Web Cam Manatee and others the website has over 20 million hits in less than 1 month and will B around for at least 10 years
lets watch the web cam horny manatee and hornymanatee.com
by King-David Granderson February 5, 2007
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Large sculpture of a Manatee, also know as the sea cow, holding a mailbox. A local ornament to the Florida Keys.
Dude let's do a shot everytime we see "manatee mailbox" in Key West.
by hotpocket81 June 9, 2009
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