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a tattoo on your ass that can be used to identify you, or be cause for ridicule
EX. 1: have you seen Maria's ass tag? it's a sea cucumber

EX. 2: i was so fucked up last night and i hooked up with a chick, and i have no fucking clue what she looks like. all i fucking remember is her ass tag, it was a zombie unicorn.
ass tag by crazzzycatttladyyyy August 4, 2014
Playing tag but have to slap those ass cheeks, or touching them. Mainly boys but girls plays too.
Kevin, ass tag.

Kevin: (runs to get lorenzo)
Kevin talking to lorenzo after smacking the shit out of his ass: Ass tag!
ass tag by NotPerson 69420 March 9, 2023

ass-tag convention 

The accepted standard that the tagged side of a towel is for designated nether-regions while the non-tagged side is reserved for the face and hair. This convention is used to avoid cross-contamination and is to be assumed as general practice. Practical in situations where one must use a borrowed or foreign towel.
"I forgot my towel in the shower and had to use my roommates. Hopefully he observes the ass-tag convention."
ass-tag convention by Octoclod September 17, 2013

ass tagging

Tattoo on a guy or girl, usually on the ass or lower back, of another person's name.
I can't believe that Meldoy let him ass tag her. It's too soon for ass tagging.
ass tagging by Dinogrrl March 31, 2016

Ass Tagging

When you don't need to see someone's face in order to tell who they are so you look at their ass to check.
Friend: Hey who's that person right there?
You: I think that's Rachel.
Friend: How'd you know?
You: That's her ass bro. I was ass tagging.
Ass Tagging by NotArianaGrande January 27, 2019

tagging that ass 

When one or more men gives it to a female in a relentless manner from behind
He was tagging that ass so hard the it knocked James's moms trailer off of its blocks.