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2.
Lightweight friendly insult, insinuates that the person is rather useless and lacking a few clues. Slightly hopeless person
What a bunch of pinna's
Don't be such a pinna mate!
by Teddy Ruxpin October 30, 2003
 
1.
Stemming from 'pindick' (pin sized dick) - this word defines someone with an unusually small penis. It is generally used as a derogatory term and has no known medical connotations.
1) You're a proper pinna!
2) Hey pinna, how u doin?
3) You've got a right pinna!
by Mr Curt September 21, 2006