downing the rest of your drink when you near the front of the line at a club, bar, concert etc. it is necessary to perform a stealth slam covertly so as not to alert the bouncers or security at the venue. a stealth slam often involves the slammer's friends blocking the view of the fore-mentioned security.
trevor: yo steve, we're almost at the front, you better lose that beer.
steve: shit you're right, cover me, i'm goin for a stealth slam.