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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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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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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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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When one finds money once lost to their own idiocy. It is quite possible said individual never knew they had suffered the twat tax in the first place.
When you put on a pair of jeans not worn in six months and find a mashed up £20 note in the pocket. "Sweet! Twat tax rebate!"
by dooferdog March 21, 2017
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