- "I'd say he's the runt of the litter!"
- —Ceegar, on Marty McFly
Runt was a word frequently used by Buford "Mad Dog" Tannen and members of his gang in 1885. It was used to describe a small, weak person in comparison to others.
Marty McFly was called a runt by Buford "Mad Dog" Tannen presumably because of his small appearance to him.