A Pieco is a shortened version of Pierce that originates from the YouTube channel "Pieco". A Pieco is also a term used to describe someone who is an insensitive cunt and disregards anyone else's intrest apart from their own. It is reccommended that you avoid a Pieco at all costs as it will ruin your life.
Person 1: "I heard that <insert generic name here> is a Pieco
Person 2: Really? I should never associate with him ever again.
Person 2: Really? I should never associate with him ever again.
by Guru of Slang May 10, 2018
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