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Usually an accomplished bodybuilder who has half natural, half steroid gains, in either order.
The best way to describe it is when your friend got huge naturally then just started juicing recently.
"bro how did you get that big without steroids"

"I'm half natty"

or

"bro you're only bigger than me because you've been on steroids longer"

"I'm half natty"
by Roidzzz March 02, 2014
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