Text/Internet slang for "Go Back To Europe Whitey", usually in response to GBTAN ("Go Back to Africa N*****")
Both have been used from time to time on Evony, but the terms are used on other online games as well.
Player #1: PWNED
Player #2: GBTAN
Player #1: GBTEW
Player #2: WTF? That's racist!
Player #1: If you don't want it, don't start it.