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When a man has an unusually small unit, sometimes referred to as an inny in cold weather situations. Less than 2" long dick
Joe's dick was so tiny, we said he was Hung Like A Seahorse.
by o.t. guy December 09, 2010
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A phrase used as an insult from one to another.

The receiving end of the insult must be male otherwise it wouldn't make any sense and that person would automatically win the insult battle.

The exact opposite of being "hung like a horse".
Guy#1: "Dude, Shut-up I'm hung like a horse!"

Person#1: "Yeah... hung like a seahorse!!!"

Person#1: "HAHAHAHA I win one to nothin!!!"
by Freed-olay January 10, 2008
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