Top Definition
When using FB check-in and you tag not only the group you are with, but start tagging random people in your friends list causing havoc.
Eddie checking his FB feed: Damm it I got Flash Tagged again! If my wife sees this she'll think I was out again and I'm gonna get cutoff.
by Mikeyl16 April 26, 2011
To sum up your Twitter post in one word
My Mum is singing campfire hymns #Mumbyah ...I totally flashtagged that one
by GoggleboxUK May 12, 2015

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