"Powter" Natural Recordings by Native Speakers
There is no word "powter" in English language. It's possible that it's a made-up or non-existent word.
To be "powned" is a slang term that originated from online gaming communities and console gaming culture. It means to defeat or outplay someone in a game, especially in a dominating or humiliating way. The opposite of losing or getting defeated, often with a sense of one-sided victory or embarrassment.