Synonym for average. Derives from 5.9 inches being the average penis length in human males. It is pronounced without the decimal point. ("Five-Nine")
Yo man, how was transformers 2?
Ehh. it was pretty 5.9
Yeah.. but you got to see Megan Fox panties shot, so its so worth it
Natural Ice beer. (Referring to the ABV of the specific beverage.) Term originated in San Diego, CA.
Person 1: "what you doing tonight?"
Person 2: "drinking that 5.9..."