Top Definition
Short for a 5 Hour Energy. You are so jacked up that you get the words out and it sounds like firegy.
I'm sick of Mountain Dews, I need a firegy to stay up all night tonight...and I don't want to have that 2:30 feeling today.
#red bull #energy drink #dew #jacked up #partying
by Big Aud August 10, 2010
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