look up any word, like donkey punch:
 
1.
meaning if something is free dont find the flaws in it.

one way to tell a horses age is by looking at the wear on his teeth , if someone gives you a horse theres a good chance it is old and you wont get much use out of it.
sam got a bike for christmas , but it wasnt the one he asked for .... "dont look a gift horse in the mouth"
by the_colt23 April 21, 2011