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Sinbox (noun):

A vagina - particularly one belonging to a female co-worker, or a girl you meet on the internet.
Leroy: "What's up, dude? How'd your date with that chicky from work go???"

Ian: "Oh maaan! I totally delivered in her sinbox!"
by ENLS March 08, 2009
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When the inbox for your internet email address becomes loaded with junk mail because of irresponsible internet surfing.
My inbox became a sinbox over a couple of weeks.
by Ereck Flowers May 03, 2019
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