Best used in random moments. Fonz played out good you on Christmas bender 2012. Good you utilized usually while intoxicated, preferably on a thirty Thursday.
Fonz: Hey Phil where we going?
Phil: Good you?
Fonz: Not bad.
Phrase popular on various image board websites such as 4chan.org. It's a phrase used to mock posters which ask mundane questions alongside a sexual image.
References a meme in which a figure is seen holding up an image of an anime girl to a crowd, asking "Is coffee good for you?".
>OP: posts thread asking about the weather alongside a sexual image
A casual, slang expression which can be used in a variety of situations. It can be used as a response to a person's rude remarks, behavior, ineptitude, or unreasonable demands and favors.
Similarly, It is another way of saying don't worry about it, it's not your fault, you're fine, no thanks, or that's OK.
When someone accidentally bumps into you at a crowded bar:
Person 1: "Oh my bad man, I didn't see you there."
Person 2: "Nah you good."
When asked to do a favor:
Mom: "Honey, can you take out the trash? It's overflowing and there are ants everywhere"
Son: "Nah you good."
If someone tries to cut you in line at a fast food restaurant, throw out a stiff arm and say "nah you good."
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.