Short for potranca (Spanish) which is a horse that is hard to tame, wild. Thus it refers to a woman with a strong character who doesn't let any man control her, can't be "tamed" (does what she wants).
Uno de estos dias va ser mia la potra, va caer.
by Jeanineeee July 18, 2006
a girl that lets no man put her down, a harrd bitch
i heard nikki is such a la potra she rejects every guy in the skool
by leah and rico March 06, 2005