What is Sandblast?
1.
The act of skeeting on a girls face then throwing sand at her and running away
"Dude what happened to that girl you took to the beach?"
"Oh I sandblasted her ass and took off"
See
2.
A style of demin shorts or pants that are usually
Person 1: Hey man, why does that guy's pants look like they've been changed to a lighter color near the knees?
Person 2: It's called a sandblast