adj. An abbreviation of the phrase "too gay to function". Used in some social circles to certify a person or object's fabulousness/homosexuality. (example 1) It can also be used in a negative connotation, but adds style to an insult. (example 2)
example 1: "Oh em gee! We are so 2G2F"
example 2: "What was with that math test? It was 2G2F!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. 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.