Top definition
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
Get the mug
Get a Sinbox mug for your guy Paul.