Have you ever looked a gift-horse in the mouth?

Question

Have you ever looked a gift-horse in the mouth?

Answer 1

lol

not literally ;)

Answer 2

yea i did and guess what there was a hundred dollar bill in there

Answer 3

Yes, literally.  To confirm the age of the horse.  Horses' teeth have distinguishing characteristics that will tell you the approx. age and past level of care.  It is important medical info that you may not get with a "gift" horse.

The saying comes from when horses were the primarly mode of transport.  It means that one should not critique something given to them for free.