A guy that is very hot.
"Did you see the new hottie?"
"Yes he is a sin!"
by starpphire November 2, 2011
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SIN actually stands for Sexy Irish Nerd. By definition all irish guys are sexy; however, only a elite few are actually sexy irish nerds.
I am in love with a SIN.

Dave is a SIN.
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the shortened form of the word assasin, commonly used in ragnarok online, maplestory, etc.
eg.
Warrior: damn man, check out that sin, he hell ksed that mage.
Archer: yer man, sins pawn every1!
by ghost faced killa July 6, 2006
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The act one engages in when one is just finally beginning to have fun.
When finally the hard-working Mennonite had enough money to feed his family, he paused; knowing gluttony to be a sin.
by Shanya Almafeta May 9, 2003
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Self-Inflicted Nonsense
by theJT October 21, 2009
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Small Indian Nipples (Basically the opposite of BBTs)
by kirbykirby64 October 16, 2011
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