The act of wearing no underwear while in uniform while deployed. Slang word used by soldiers, while deployed.
Soldier #1: "Man bro, my balls were sweating like crazy today! You got an baby powder? It's gotta be like 190 degrees today in Iraq!"
Soldier #2: "Nah Bro, I'm Sandballscapin' today! I didnt even bring any baby powder! Boxers, briefs and drawers are so first deployment! Get with the third!