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1.
Someone who has become mentally deranged.
He went dinny. You can visit him in the mental hospital. (Probably derived from Romany "dinlo").
by Le Macho August 09, 2006
 
2.
Another word for "dont" by Scottish people who cant spell it "Dinnae"
" I dinny ken how to spell Dinnae "

by Gemma =] October 31, 2007
 
3.
A dinner party
I'll go to Hibbah's dinny tonight.
by roschelle July 12, 2013