What is Sinbox?
1.
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!"
See
Random Words:
1.
To choose something from other stuff
-You have lots of colours of this car to choose, so take your pick...
-I'll take the pink on..