Top Definition
The fandom's nickname for the moustache of Dr. John Watson, which appeared briefly at the beginning of BBC Sherlock's third series. During 'The Empty Hearse' several jokes are made about the Johnstache, until eventually John shaves it off, famously saying "I don't shave for Sherlock Holmes!"
Johnstache ate my ham.
by Consulting Criminal 2014 January 25, 2014

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