Definitions by BCN Leo Messi

S.I.N.S 

That akward moment when you get called out and should be sorry and your completely not. SORRY IM NOT SORRY.

"Dude you left me at Sutton Club last night, not cool!"
"Oh, sorry im not sorry, s.i.n.s."

S.I.N.S by BCN Leo Messi January 18, 2012