I would like to propose “you got flanked” as the table-top RPGer’s alternative to getting “pwned”. We can also use the term “sneak attack” but then I suppose that one should only be used for the most intense of situations, when “flanked” just doesn’t seem like enough. It’s gotta be really intense, though.
NOTE: I never really got into Counter-Strike (you know… where most people attribute the term “pwned” to have come from?), or any multiplayer experience for that matter. As the moment, my multiplayer gaming is limited to being invaded by Black Phantoms in Demon’s Souls – or as I like to call it: “some moron is trying to ruin my day, and on purpose!”. As you could expect, this doesn’t exactly help me warm up to the whole concept of multiplayer, at all.