All y'all be like
All y'all be like
I’m southern, let me help. “Y’all” refers to a group of people. It usually means the group of people that the speaker is speaking to, but you can also define the group, like “y’all in the other room” or “y’all Canadians”.
“All y’all” refers to the entirety of that group, as opposed to a subset of a group, which would be “summa y’all”, or none of a group, which would be “nunna y’all”.
But you wrote the slang correctly! Unfamiliarity with the slang is an opportunity to educate about our language.
(Source; we been sayin' all y'all since before y'all non-Southerners were even sayin' y'all.)