Mustache posts often occur when an ask blog receives an ask along the lines of "I mustache you a question". In a mustache post, the blog's mane character(s), regardless of gender, are shown with mustaches and optionally beards.

Mustaches are also strongly associated with Raikissu, queen of Tumblr pony.

Join the Mustache collects mustache posts from all over Tumblr.

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