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!"