rare indeed. Even the Urban Dictionary is blank. The did have "cocking a beer".Who says this is a waste of time? I learned a new expression today thanks to our little pastime.
Were it not for our conversation, I might never have learned what "cocking a snook" means. Thanks for your part in my education!
Striking your beer bottle straight down on someone else's beer bottle such that the concussive force causes the other's beer to erupt like a foamy volcano. A common grundy to play on a lightweight by feigning to cheers them. The word cock is an onomatopoeia for the sound of the collision.