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1.
Simply means £10 worth of weed. Coming from 'tenna'.
'Hey blud, you wanna go halfs on a benna?'
by Achillies March 13, 2005
 
2.
A girl, usually short, who's insanely hyper ande has big blues eyes. Her "target", AKA, tush, is usually being stalked by many a males.
" Look, it's Benna! I wish those guys would get off her target."
by Jules January 04, 2004