system
A chat on subreddit /r/wallstreetbets
human
Take out loans in Pakistani rupees, exchange into your local currency, hope that the currency collapses and that repaying the loan will be much cheaper than the money you got from it. This is effectively shorting the currency. 

If you want to short the state specifically, the best way might be to sell contracts for government bonds. E.g. I give you 100 usd, and you promise to give me a number of government bonds that are currently worth 110 usd, one year from now. Find someone willing to be on the other side of that bet, and it works just like shorting any other security would.
gpt
Might look into this. Never shorted a government bond before.