Definition of shotgun:
(n) :
a gun which fires loads consisting of small metal balls, called shot, from a cartridge; the front passenger seat in a vehicle, next to the driver
"I've got shotgun! (I will sit in the passenger seat.)"
(v) :
to inhale from a pipe or other smoking device, followed shortly by an exhalation into someone else's mouth; to verbally lay claim to (something)
"I got a day off because I shotguned it."
(adj) :
of or relating to a shotgun; occuring as a result of the threat of force
"the ground was littered with shotgun shells."