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1.
a durable and robust person
The man may not look like much but he is a tough cookie.
by Light Joker May 22, 2006
 
2.
A snarky, obstinate person who appears to be definiant for no good reason, although they likely have one and aren't telling you. They are masters of walking the line between displaying affection and acting like they don't care.

Watch out for emoticons like this

:^)
I would have married him, but he was a tough cookie.

That broad is one tough cookie!
by blochhead March 11, 2010