She rarely spoke, but her brother could 'talk the hind legs off a donkey'. [=he was very talkative]
It's rude to 'talk' [='gossip'] about people behind their back(s).
The dog stood on his 'hind' [='rear'] legs, begging for food.
(..) Nearly the same age I was when I had met him. This is the picture of Old Man Kangaroo at in the afternoon, when he got his beautiful hind legs. The days passed, and I watched as he forgot how to walk... What's my name? ...how to talk. I'm Daisy. (..)2008 The Curious Case of Benjamin Button
(..) That's what my momma said when I was gonna have a baby brother. But he didn't live long. Cause he didn't breathe right. ...when he got his beautiful hind legs just as big God Ngog had promised. You can see that it's five o'clock, because big God (..)2008 The Curious Case of Benjamin Button