If someone says they're 'not about that life' it means that they don't or won't do something relating to that subject. It can be used in a variety of contexts and can be about a lot of things but it mostly used to reject someone inviting you to do something because you don't agree with it/don't like what they're doing/just don't want to.

It can also be edited to fit the purpose more by adding in a word before the word life to describe what kind of life said person is not about.
Example 1-
Person 1: Hey, I'm having a Sexy Party this weekend, wanna come?
Person 2: Nah, I'm not about that life. I'm sure you'll be coming enough for the both of us.

Example 2-
Person: Want to take a picture with me?
Person 2: Nope, I'm not about that selfie life.
by notaboutthatlife December 28, 2013
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Wasting time, doing nothing in particular. Also, can mean finding idle tasks to do while wasting time.

Comparable to dilly-dallying.
I'm just faffing about until lunch time.

_or_

- What are you doing there, working?
- Nah, I'm just faffing about.
by eydryan September 20, 2011
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A response of disapproval given after someone suggests something that you absolutely don't want to do or don't agree with
Me: What do you want to do over break?
Abbie: How about we go skydiving without parachutes?
Me: How about no?
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Extreme procrastination when a social appointment is looming, a process that often results in Mortlocking it.
The party was at 9pm, but I was Forstering about with Facebook and finally got in the shower at 8.55.

Simon had been Forstering about and home with some quackish treatments for McDonaldism and, by the time he actually got to the docks, all the best sailors had been taken. As such, he ended up having to go home with Vladimir One-Bollock, who also has syphilis. That'll teach him.
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As it is explained by Johnny Depp, who plays Donnie Brasco in the movie "Donnie Brasco"
"Forget about it" is like, if you agree with someone, you know, like "Raquel Welch is one great piece of ass, forget about it." But then, if you disagree, like "A Lincoln is better than a Cadillac? Forget about it!" you know? But then, it's also like if something's the greatest thing in the world, like minga those peppers, "forget about it." But it's also like saying "Go to hell!" too. Like, you know, like "Hey Paulie, you got a one inch pecker!" and Paulie says "Forget about it!" And then, sometimes it just means forget about it.
by Donnie Brasco March 9, 2005
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A phrase very commonly used by rappers to describe their lifestyle (thug lyfe). To be about that life means to live a certain kind of way.
She claim she bad, but she ain't really about that life. She's a photothot.

Most these rappers flashing guns but they ain't really about that life
by Chukssss June 29, 2015
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The term "Biebering About" is used to describe the bad driving nature of someone. Typically used in a derogatory manor meant to insult the individual, because Justin Bieber drives like an asshat. This term was brought about after his run in with NFL star, Keyshawn Johnson, in the private residential community they reside in. Don't be afraid to call a buddy out on tooling around like an asshat in inappropriate situations. We have race tracks and events for a reason.
Ex 1:
"Did you see that idiot speeding down the road and weaving all over the place?"
"Yeah, they were biebering about."

Ex 2:
"Chris, Quit biebering about! You're going to get us killed!"

Ex 3:
"Kimberly was killed by someone biebering about when she went to the store for hot dogs... I was really looking forward to a hot job."
by tcbar June 12, 2013
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