Top Definition
The near-mythical largest of dongs. Generally so large that it can not and will not ever be used for fear of harming a living being. Also known as 'Skinny Man BuhdonkaCock' the Fish Dong is a Dong that long, that strong and will do a dance if you sing a song. More of a curse than a blessing it has bestowed strange powers of happenstance upon all those who have wielded it throughout time.
"The only reason Marks still a virgin is that Fish Dong he's packing between his legs. He'd split a girl open like a turducken with that thing."
by Das Bigly April 22, 2010

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