What is a good way to have a bit of wedge (money) and lose it?

Stand just outside the convenience store door flashing it around at passerby's. 🏪

Casino.

One time I went in with $200 eventually went up $1500. Got greedy, list a lot and left with $400.

But still came out ahead.

Gamble.
Flash your money.
Lose your wallet.
Buy lottery tickets.

tell someone where it is

Online gambling.