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1.
someone very mardy and when doesnt get their way acts like a cow!
kid: But i want it mummy
Mum: Well you cant
Kid: Fine Well Im Never Going Shopping With You Again
Mum: Oh stop being a mardy moo
by SOMERthomas September 15, 2009
 
2.
When a grown adult takes offense to something, usually results in the lowering of the bottom lip, going quite and generally being a big baby. Also known as a "Watkin"
Not being Invited out with the boss for a drink and night out!
Being called Fat gets the mardy moos
by Napalm Tugboat March 03, 2011