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
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