All Good.

Gangsta, Gangster, mobster, hood-rat. One who makes a living off of the streets and will watch his homies back, may sell drugs and/or participate in random or planned acts of violence against other "G"s and their homies.

Accronym for: All Good
AG - Aye Gee

The typed equivalent of a quick, exasperated sigh.

It is like "ugh" but without nearly as much angst. A great alternative if you're running out of ways of saying "ooft".
(Originally derived from a shortening of agony)

A.G ; when you like your own comments and/or status on facebook.

1) Periodic symbol for silver.
2) The sound a woman makes when she attempts to deepthroat a penis that is much too large for her mouth.