Top Definition
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
2 more definitions
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
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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