A portmanteauof "retarded" and "petard," it describes a plan backfiring on you in such a way that you are left looking utterly ridiculous. It combines the concept of retarded--which is to say mentally deficient--and the phrase "hoisted by your own petard," which means to have damage done to you by the means you had intended to employ to damage others. A petard is an explosive used to break down barricades in warfare, and so petarded can also mean "blown up," in some circumstances.
You ratted Dan out for stealing that camera, but in doing so proved that you were his accomplice? Dude, you're petarded.

Jim just petarded the front door trying to take out his ex, but the door blew up and a shard of it went through his windshield. Totally petarded.
by Talmanes December 01, 2006
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family guy's,peter,sufers from this illness.petarded is the name of one of the episodes where peter finds out he is retarded.(I won't tell u the rest,it'll ruin it for u)
you're so petarded.

stop being such a petard.
by Ching January 07, 2006
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When your clinically insane friend happens to be named Pete.
I took my friend Pete to the club, and he was thrown out for acting Petarded.
by Rubenderovr April 18, 2018
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A slang commonly used by those who observe the misuse or "rushing" of units known as petards in Age of Empires 2: Age of Kings.
That was so damn petarded!
by Massive Johnson Esquire February 23, 2003
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Taken from "Hoisted by his own petard" (Petard is some 16th century shaped charge for breaking into fortresses. If the bomb goes off while the French guy is installing it on the wall, he is then hoisted by his own petard). So when you or someone has plans or an occupation or way of doing things that blows up in their face or defeats their own purposes, they are then, petarded. Especially fun if you can't use the 'r' word in certain company...
He tried showing off by rushing through but he just screwed up spectacularly and now he's soooo petarded.
by WhatDoYouMeanYouPeople? June 16, 2018
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