Google is also a good source for infomation as well..Just add the word "beer" or "brewing" to whatver you're looking for and you'll find it...:
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Revvy's one of the cool reverends. He has a Harley and a t-shirt that says on the back "If you can read this, the bitch was Raptured. - Madman
I gotta tell ya, just between us girls, that Revvy is HOT. Very tall, gorgeous grey hair and a terrific smile. He's very good looking in person, with a charismatic personality... he drives like a ****ing maniac! - YooperBrew
SG (Specific Gravity) is just a generic term for any gravity measurements. OG (Original Gravity) is the gravity measurement taken immediately before the pitching of yeast. FG (Final Gravity) is the gravity measurement taken at the end of fermentation.