yeah ive heard that before. i think it means pull up your pants or dont be so full of yourself or something like that. im pretty sure its the first one though but dont quote me on it
Pants
Mutt means dog, esp. a mongrel. But it can also mean a person regarded as stupid or incompetent. So you could say '' Look at that mutt'' or ''Hey mutt'' or ''You mutt''
"you farted."
Britches, or breeches, are pants used in riding horses. Meaning hold onto your pants. Can also mean the same thing as "hold your horses"
Little Britches was created in 1950.
witches britches
The term "light in the britches" is a metaphorical expression meaning someone who is lacking in intelligence or common sense. It suggests that the person is not very bright or clever.
MUTT
In Britain I just discovered it is a slang term for admiring a wife or mistress.
Mutt the Mutt Trainer - 1919 was released on: USA: 6 April 1919
Her EX-Husband's name is Mutt Lange. and he is mean Current husband is Frederic Thiebaud. He happens to be the ex-husband of the (ahem) less-than-drop-dead-gorgeous gal that Mutt committed adultery with.
a Mutt costs an average of $600