when you are hiding the fact that you inject methamphetamine from your gf/friends,so when you purchase said meth you pack yourself the tiniest pipe and smoke it infront of everyone making sure they all see. then with the remaining meth you sneak off and spike that vein.
A female bends over to get one of the guys a beer. One of the guys sees a bright pink thong sticking way out of her paints. He then announces to everyone "hey your Carla is showing" She then covers it up and usually slaps the accuser.