1 - a technique in smoking where one person puts the side of the blunt with the ashes in his or her mouth and blows out, while the other person sucks in all of the smoke. also refferred to as : shotgun, gunnie, gun.
2 - when you take a hit from a blunt, and then lace your fingers (kind of like holding hands) with another smoker up to both of your mouths. you blow, and they suck. it's just an easier way of the first one.
3 - claiming the front seat of a car. usually reffered to as 'shotgun'.
1 & 2 - " Give Me a Shottie, Man! "
3 - " I call shottie! "