As a noun middy
is a midshipman.
As an adjective diddy is
very small, tiny.
middy
English
Alternative forms
*middie
Noun
(middies)
(nautical, slang) a midshipman
(AU) A measure of 285 ml (10 fl oz) of beer; a pot.
diddy
English
Adjective
(er)
(UK, informal) very small, tiny
Synonyms
see