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1.
Using agression to gain respect and/or fear from one's peers; a defense mechanism employed due to insecurity.

It's the same principle by which the runt of a litter of pups will sometimes become a biter because they don't know a better way to secure their food and/or place in the pack.
She's being a runty bitch today. She thinks that makes her a thug, but it don't.
by Mandy S. July 21, 2005
 
2.
spunky, feisty, wriggly. Aka runticular.
As runty as a retriever.
by markie howie September 30, 2003