a sexual activity in which gay males take turns ejaculating into the same man's rectum (cornhole), in effect covering their penises (dogs) in the semen (batter, deriv. of 'baby batter'), of fellow penetrators. The end result is penises getting battered with semen and baked in the heat of the man's rectum (oven), thus becoming corndogs (warm penises covered with another's semen), as opposed to simple dogs (uncooked penises without a semen glaze).
David: That's really weird man.
Self Michael: Gross!