A colloquialism generally referring to an alcohol abuser's sobering up time. Can also be used as a general reference to refraining from any bad habit, i.e. diet or drug usage. Closely related to fell off the wagon.
1. "Hey Bill, you wanna do whiskey shots tonight?" "Sorry Bob, I'm on the wagon."
2. "Hey Jim, you sticking to that Atkins diet thing?" "Yup, I'm still on the wagon."
by Drinkin' again January 19, 2005
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refraining from the drinking of alcohol
From 2012

Tony: After 25 years on the wagon! Are you out of yo' mind?
by misterblah August 7, 2011
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From The Shining (film)

Jack Torrance: Here's to five miserable months on the wagon, and all the irreparable harm it has caused me.
by mtakil July 4, 2005
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refers to an ass, butt, booty, etc. Typically used when referring to a particularly big booty, but can be used for all shapes and sizes. called “the wagon” because it follows behind you.
guy 1: damn you see rashida’s pics from the party last nigh? she thick asf
guy 2: yeah she got the wagon fr. she could get it.
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