Top Definition
The act of exibiting the full male genitalia through the front hole of your boxers. While having the back end of the boxers rolled and jammed up your asscrack like a thong.
Hey Jimmy, if I show you my Sailfin will you show me yours?
by Nicholas J. March 15, 2005
The full male genitalia through the front hole of your boxers. While having the back end of the boxers rolled and jammed up your asscrack like a thong.
Hey Jimmy, If I show you my Sailfin will you show me yours?

How bout I whipout the Sailfin and get this party started.
by Nicholas J March 16, 2005
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