According to webster:
hot rod also hot-rod (htrd)
n. Slang
An automobile that has been rebuilt or modified to increase its speed and acceleration
According to me:
Big motor, big cam, big gear, little car. If its a Deuce, even better.

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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13