Definition of "diddy"

It’s what they call a roany bush. Well, it’s green now, but in a month’s time it’ll be as red as a fox’s diddy, and you wouldn’t know it for berries growing all over it.

1911, Joseph Campbell, Mearing Stones‎

They always have a big belly or a new babby hidden inside the shawl suckin on her diddy.

2015, Martha Long, Run, Lily, Run, page 155

Hell, I almost regret editing out my original miss-spelling of the word 'literacy', since your sense of humour seems to be in need of some assistance, and that would have been a classic, one-off opportunity not only to make me look a right diddy, but to finally prove that Americans do understand irony.

2004 September 9, Iain McFadzen, “Remake of Taxi pissing me off”, in CGTalk‎

Me mither mend't me auld breeks, / But ay! but they were diddy;

1894, R. Brimley Johnson, editor, Popular British Ballads Ancient and Modern‎, “Robbie Tamson’s Smiddie”

There's a pear orchard, and a knot garden, and a diddy little lake that's just big enough to swim in . . hey, if the weather stays like this, we can have a dip tomorrow.

2013, Angela Woolfe, The Surprising Life of Charlie Glass (size 18 and a Bit), page 380

Real Gypsies despise them and call them ' diddikais — dirty diddies,' and half the sins laid at their door have been committed by these diddikais.

1943, Journal of the Gypsy Lore Society, page 82

Last month a diddy told my fortune.

2011, Mary Ellen Dennis, The Greatest Love on Earth, page 90

To the typical genre reader a diddy would be, to borrow a term from John Dickson Carr, below suspicion.

2012, Curtis Evans, Masters of the "Humdrum" Mystery