Top Definition
A sophisticated level of suave sassiness.
My, that is very firthy of you.
by The Firth January 27, 2015

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Filthy and dirty.
You are firthy for cheating on your girlfriend.
by Poiso May 06, 2004

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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