Bobbing on cock (the "oar") in a swimming pool and/or getting tea-bagged while floating on a raft. Variant: Doing push-ups, poolside, while bobbing on the cock of a swimmer floating in the pool.
Girlfriend: Did you blow that guy while floating on your Pringles inflatable raft?
Her: He treated me like a Used Canoe.
I was backfloating while she went upside down on me like a Used Canoe.
Look at that little guy by the pool! He's covering that D like a used canoe.