An uncircumsized penis that smells of sea food.
"Omg... I was unbuttoning his pants, and... No joke.. He had... A SEA SLUG!!"
by J. Michael C. April 25, 2006
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One of those freakishly huge double-sided dildos.
"Check it out, man! She's breaking out the sea slug!"
by Char H January 11, 2006