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1.
In Polish language: A male who allows other men to fuck him in the ass. Probably taken from prison slang. Currently used outside of its literal meaning, similar to English "motherfucker", but still a heavy insult.

There is also a derived verb: "cwelić" - to force-fuck someone in the ass
Ten nowy okazał się byc kompletnym cwelem, pół biura rucha go na zlecenia.
by htv October 08, 2010