One person takes a shot but doesn't swallow it. They then spit the shot into the mouth of the player receiving the baby bird shot.
guy 1: Bro last night Edward got so fucked up he did a baby bird shot
guy 2: Gross, who was the mama bird?
guy 1: It was Adam
guy 2: Damn, his brother?
guy 1: yep
The act of spittingsunflower seeds into a bottle, then emptying the bottle into your partner's anus, and having your partner fart the seeds out, like a shotgun.