What is the meaning of Crusty?

Having a crust, especially a thick one.

Short-tempered and gruff but, sometimes, with a harmless or benign inner nature.

Of very low quality; crude visuals or harsh, granular sound. (Can we add an example for this sense?)

A tramp or homeless young person with poor cleanliness.

A member of an urban subculture with roots in punk and grebo, characterized by antiestablishment attitudes and an unkempt appearance.

Source: wiktionary.org

See also