What is Sandbar?
1.
The act of wetting your penis and covering it with sand, then sticking it inside of a girl's ass
That bitch didn't even see the sandbar comin!
2.
The area between the dick and the ass. Also referred to as the grundle or gooch.
Please fondle my sandbar.
See
3.
An extreme skid mark left on the toilet bowl.
I just had to scrub my brother's nasty ass sandbar off the toilet!
See
4.
The perineum.