My question is all about the perceived formality of using about in the sentences like I'm all about that bass.
How (in)formal is using about like this?
OED has this definition for this usage:
to be (all) about: (a) to have as subject matter, to be concerned with; (b) to consist of essentially, to have as point or purpose; that is what it is all about: that is the reality of a particular situation or of life in general; (c) to be principally concerned with; to be in favour of or fond of.
In OED, the first usage is from a1400 and there is an example from N.Y.Times as of 2006. When it involves "I" as in "I'm all about..", it sounds less formal and it usually appears in song lyrics. The title of my question "I'm all about that bass" is a song from Meghan Trainor. OED has another lyrics example from 1980 which is an informal usage:
Ya see I'm all about makin that cold cold cash.
‘Sugarhill Gang’ 8th Wonder (song)
And here is the example from N.Y. Times from 2006 (which lacks "all"):
This hotel is about eccentricity and the unorthodox.
The site http://public.wsu.edu/ says that this usage should be avoided in very formal English. (formal vs. very formal?)
“This isn’t about you.” What a great rebuke! But conservatives sniff at this sort of abstract use of “about,” as in “I’m all about good taste” or “successful truffle-making is about temperature control” ; so it’s better to avoid it in very formal English.
Another point is using "all" or not. Using "all" appears to be for emphasis but does it affect the formality? How about using this phrase for people vs. inanimate objects?
This question focuses on the meaning so not a duplicate: To be about; to be all about
For the meaning of the lyrics, see: New (slang?) meaning of bass?