Used in slang especially in Britain, in place of "No Way" or "Bullshit"
The way it works is that it negates the following sentence, much in the way the above examples would. used in street slang and grime music

Usually used in a Derogatory nature what ever word follows now means the opposite of what it meant before. Can also be pronounced “bout”

All around; on every side
The construction not about to is often used to express determination: We are not about to negotiate with terrorists. A majority of the Usage Panel considers this usage acceptable in speech but not in formal writing. ·About is traditionally used to refer to the relation between a narrative and its subject: a book about Cézanne; a movie about the Boston Massacre. This use has lately been extended to refer to the relation between various nonlinguistic entities and the things they make manifest, as in The party was mostly about showing off their new offices or His designs are about the use of rough-textured materials. This practice probably originates with the expression That's what it's all about, but it remains controversial. Fifty-nine percent of the Usage Panel rejected this use in the example A designer teapot isn't about making tea; it is about letting people know that you have a hundred dollars to spend on a teapot.

almost, but not equal to

The canadian version of an american favorite.

(A.B.O.U.T): A Bunch Of Useless Talk regarding . . .

Adjective - Something someone (like your gossipin' friend !) told you that is totally useless to you and does not affect you in any way.

Useless talk
About
Gossip
Gossiping
Gossipin'