The guy pulling the strings in a crime. They're often the mastermind/criminal with the plan.

These individuals are often more invested in a life of crime than their associates.
You can clearly tell he's the heavy in this case.
by Price-Line-Negotiator November 10, 2014
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when something is cool,appealing,hip, or amazing
Hey dude did you check out that band, they're so heavy man!
by Alex Ian November 08, 2007
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Stupidities that conflict with everyday life.
Example 1)
Pete: "Look at that homeless guy wearing a wool sweater, its July 18th!"

Matt: "No way! Where?! This guy's heavy."

Example 2)
Brick layer Mike: "Hey, pass me a cinder block on the plank."

Brick layer Joe: Non, my harm hurts from pelting da snow last night."

That's Heavy
by EnviroLawn July 19, 2011
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Defining a person who seems to always hold grudges against others and cannot move on from the past. Essentially heavy refers to the fact of the matter that these people are collecting baggage and building up on grudges.
Why do people act so heavy?

Or

Man is he/she ever a heavy...
by Jonnyvision October 04, 2016
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Another word for Unbelievable, something that just comes up out of the ordinary.
Jesse: I got this thick bitch pregnant dude.
Mark: That`s so heavy dude!
by Mingoka2021 November 23, 2016
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