This is a phrase used to express that ur not gonna do something you dont wanna do. This happens to be the best comeback to anyone asking you to do something for them; It lets the person know that doin a favor for them is not "good" for you.
Ruby Tuesday Cook: "Hey man can you prep me some Tomato Mozzarella"?
A more polite way of saying "I don't give a flying fuck" in Instant messaging. Although McDonald's new bullshit slogan uses the same lack of punctuation,nah im good is not used by closet homosexuals like Justin Timberlake.
0TTR: It's PEANUT BUTTER JELLY TIME! *link to eBaum's world*
mrterryakiman: nah im good
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.