to pregame in the shower. there is no actual "shotgunning" involved so this may be done with a mixed drink or a beer. The only stipulation is that the drink must be drunk ENTIRELY in the shower.
chick 1:you're so trashed... what happened??
chick 2: well, I only had a half hour before we headed to the party so instead of taking time to get ready and then pregame, I just shower shotgunned my screwdriver.
chick 1: probably not your best decision...