Crapping or taking a dump. Since the Cleveland Browns have never gotten to the superbowl it is unlikely that people will confuse this with anything actually football related.
Dude1: Where you going?
Dude2: I'm taking the browns to the bowl game.
Dude1: Good luck, go for the 2 point conversion.
When someone from outside the smoking group gets "in on the action" which is typically between two members of the original party that are already smoking and hit the bowl.