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2.
Stands for All The Gear All The Time, means you love riding, and you want to keep on riding regardless.

The gear list must be motorcycling specific gloves, jacket, pants, boots and a full-face helmet. Open-face does not count (leave your face on the road and so long for ATGATT, buddy). Jeans do not count, fall down going 20mph, and voila! you have nice big fleshless spots on your knees!

Remember, without your gear you have only one chance of accident. Crash once, and you're done for.
You gotta go ATGATT if you wanna keep ridin'
by Strayturk April 04, 2009
 
1.
A motorcycling acronym used in basic theory and practical motorcycling lessons to remind motorcyclists to wear All The Gear All The Time (ATGATT), referring to jacket, helmet, pants and gloves.
When I took my safety course to attain a basic license, I was reminded to wear ATGATT(All The Gear All The Time).
by doodoggy January 03, 2006
 
3.
Means you read a horrible story about some dude getting hit by a drunk driver and came here to find out what ATGATT means.
"Remember ATGATT!" ATGATT? WTF does ATGATT mean? I'll check out Urban Dictionary.
by chrunchy_reddit January 17, 2011