When something is on steroids, it is more powerful than it could naturally become, because of some trigger.
That gym-trainer is on anabolic steroids.

The CLK-GTR is a mercedes-Benz on steroids.
by Gumba Gumba April 10, 2004
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common name for anabolic steroids; hormones used to stimulate muscle and bone growth
I knew my girlfriend was taking steroids when she tried to root me up the ass with her clitoris.
by yorrick hunt July 10, 2008
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Synthetic forms of testosterone, anabolic/androgenic in nature, which, when researched, scrutinized, and applied correctly via the oral, injectable, or transdermal routes in combination with a well-planned and executed diet, consistently intense and strictly methodical gym work, and regular sleep patterns, will, to varying degrees and depending largely upon genetics, produce a physique possessing a state of musculature seldom witnessed outside the realm of hormonal enhancement.
Based upon the extreme and relatively sudden hypertrophy of my girlfriend's trapezius muscle, I'm willing to wager my wife's collection of rare porcelain dolphins that she's secretly undertaken a course of steroids.
by Neralich the ANTI-HERO August 19, 2009
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drugs that give you muscles the size of Texas.
mark McGuire uses alot of steroids.
by moe smith March 28, 2004
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A performance enhancing drug that causes large amounts of muscle growth very quickly, when used right.

A common myth is that people's balls will shrink when they use them, but the truth is that those people already had small testicles to begin with, thus their reason for taking steroids.
Guy 1: "Steroids made my balks shrink"

Guy 2: "What balls?"
by Godo Fall January 11, 2010
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1. natural chemicals that occur in the body (also can be manufactured) and help build up muscle tissue.
2. jimmy juice
3. what rats use to fight each other (really, look it up)
Steroids are supposed to make your balls shrink
by PlayDohMan May 10, 2004
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