not know from nothing

To be completely ignorant or uninformed (about something). Don't ever second-guess my judgment again, you hear me? You don't know from nothing! Don't mind her, Phil. She doesn't know from nothing.

know (or not know) from nothing

be totally ignorant, either generally or concerning something in particular. North American informal

See also: know, nothing

Farlex Partner Idioms Dictionary © Farlex 2017

See also:

all options stink
AOS
all in (one's) mind
come it
come it (with one)
don't ask me
don't ask me!
all in (one's) head
(I) don't mind if I do
be in tune

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