it`s not my words )

Culture is so messy to translate... in America, flicking someone in the forehead isn't what you'd do. If you're a kid, you might play "slug" (taking turns whacking each other in the arm) or give the loser a charlie horse (dig your knuckle into the muscle of their arm or leg so it's sore for day...

спорить НА щелбаны - это спороить (bet) о чем то. Проигравший получает от выигравшего оговоренное количество щелбанов.

Is this what "flicking/noogie match" means?

It can. Thank you for the explanation.

Also, you can play a variation of rock-paper-scissors where the loser gets flicked in forehead or slapped in the face.

👍