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1.
A Scottish (Glaswegian) term meaning 'One who has a worthless job' or an unimportant person.
I will not be lectured by this Diddywasher'
by Don Curlywurly March 28, 2010
 
2.
someone who washes his mums tits
hey ya beast ur a diddy washer
by Chris Toal March 30, 2004