Meaning "that's the best" or, "that's some amazing shit right there".

Can also mean "all inclusive", in some contexts
1) Steve: I just made myself some blueberry Pop Tarts in that toaster.

Andy: Man, that shit's the gear!

2) "Come on down to our soup kitchen! We have minestrone, chicken noodle, all the gear!"
by Rome_Leader April 24, 2009
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When someone is using anabolic steroids to increase muscle gains.
That guy is jacked, he must be on gear.
by Legatron November 5, 2017
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(Noun) Name given collectively to IV drug use paraphernalia.
I know Jerry’s got his gear stashed here somewhere. It’s got everything anyone would ever need to put one in their arm.
by Nikki Stixx April 4, 2020
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A slang term used for the drug methamphetamine in Australia.
'Hey man are you staying out all night tonight?'

'Not unless you can hook me up with some gear?'
by slobbyoyster February 18, 2013
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That dude is huge i wonder how much gear hes on?
by Chi-Chi January 29, 2004
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A word to describe drugs such as cocaine, heroin etc.
Skinner: Do you have any gear on you need a tick

Victor: Na sorry pal gettin heavy gear next month
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