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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
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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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2
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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