A condition usually inflicted after one's leg has gone numb from a long sit down with the porcelain throne. This renders the person into a state of awkward stumbling, similar to that of a baby horse.
John: Oh jeese look, Brian has pony legs again.
by Spider Viater December 13, 2011
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An Australian slang word for a small measurement of cannabis.

A measurement of cannabis = small stick of weed that resembles a baby horses leg (poe/nee/leh/guh).
Do you think I'm Japanese or a horse breeder? No? Then why are you selling me a pony leg.

Or...

You got anything to smoke? Nah man all I have is a pony's leg.
by Freshplateofbeans September 15, 2021
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