When a lady is giving head to 2 guys at the same time with both cocks in her mouth. Both guys "co-jizz" in her mouth at the same time (making a "shotgun" effect at the point of explosion). Then both of the men pull out and yell, SHOTGUN BITCH!!
Dude me and my boy totally took this chick home from the bar last night and fucking double barrel shotgun that hoe!! She was coughing up our man juice for at least an hour after.