A mild oath. Roughly equivalent to saying "Jesus Christ" as an oath, but less severe, and used so as not to get stricken down for blasphemy.
Geez Louise! I can't believe this definition isn't in here yet! (Actually I saw one but it was misspelled.)
n. Trucker-speak for coasting down a hill or more often a mountain with the transmission disengaged. 18-wheelers can only go so fast, and the engines slow them down when coasting, so to go faster they take the engine out of gear. Runaway truck ramps were built for people who do this.
Trucker: My load is late. I'll have to switch on my georgia overdrive and get in the
hammer lane while I go down this mountain. I might fly off a cliff, but if I don't maybe my load will be a little bit less late.
Buy a
georgia overdrive
mug!