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1.
Reffering to a thick/stupid person or a thick/stupid act. Usually used in Cheltenham in a slightly chavvy accent.
"He's a fucking dimlo prick isn't he?"
(Actually said; 'Ee's a fockin dimlo prak anee?')
by David Masson January 12, 2007
 
2.
If someone is thick or just like "duuuuh"
#1 : U hav got liquid drippin outa ur car
#2 : (looks down at feet)
#1 : Not outa ur fett ... outa ur car u fuckin DIMLO
by Ur worst nightmare June 04, 2005