What it means
Fanum tax is that jokey little food toll your mate charges for existing near your plate. A chip gets lifted, a bite goes missing, maybe a sip too. If someone says pay the Fanum tax, they want a piece of your food and they're acting like it's owed by law.
Usage examples
"I bought one bag of crisps and he took half, absolute fanum tax."
"Leave your fries unguarded and you will be paying the fanum tax."
"Bro saw my takeaway and started collecting Fanum tax before I'd even sat down."
"You can't bring nuggets to the function and not expect a little Fanum tax."
Where it comes from
It comes from streamer Fanum, part of the AMP crew, who got known online for constantly taking bites of other people's food in videos and streams. The running joke turned into Fanum tax, meaning that cheeky snack fee your friend claims when you've got food in reach.
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