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When you working behind the bar and a customer is being a right twat so you apply the twat tax
Customer: Oi bartender, I've been waiting forever, pour me a double vodka coke

Bartender: *Applies the twat tax and discreetly pours single vodka coke and charges for a double*
by Honest Bar Manager December 16, 2019
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2
Money spent by people on their own idiocy. Money spent on fixing situations caused by one's own idiocy.
On Friday night I got so bungalowed that I locked myself out of the house and had to pay £80 for a locksmith to change the locks, that's an £80 Twat Tax so far this week.
by Maraqui January 22, 2012
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3
When you owe an ex boyfriend or friend money, but they've treated you so badly that it now counts as a tax and you never have pay them back.
Your boyfriend lends you money for a flight, but then you find out he's been sleeping with other women ..... Dump him and tell him about twat tax.
by MissB. October 10, 2013
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4
The act of paying for your own idiocy
For example, if you have left your keys in the house, and ended up locked out, you'll have to call a 24 hour locksmith to get back in, you'll probably have to pay the guy £80.

That £80 is £80 twat tax.

The opposite of twat tax would be if you put on a pair of jeans you haven't worn in a while, and you find some money in the pockets, that can be known as a Twat Tax Rebait
by Whizz! January 26, 2012
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