Cool, raw, legit, looking good. It is often used in a greeting, or describing how someone or something looks, acts, appears, or works. Also, legal often preceeds the adjictive "
pretty".
"Lookin'
pretty legal" Describing how someonr looks good.
"That shirt's
pretty legal" Describing how a shirt looks good.
"That bike is pretty legal" Describing how a bike looks good.