French to English Other Slang Greetings

Hello, I'm looking for the English equivalent of a slang verb - tchecker or checker - used by teenagers (and younger), mainly boys, to describe how they greet each other by touching their fists together. e.g. "Il m'a tchecké" "j'ai fait un tcheck". This seems to be replacing the French male handshake for the 11-30 age group … :-D
It's not the same as a high-five - (and high-five sounds too lame for my context anyway).

Context: it's in a screenplay. After a big boxing match, there is a cocktail reception. The victorious boxer comes into the room and is greeted by a friend.

"Tu m'as fait gagner 2000 boules mon pote!"
Il met son point en l'air pour faire un check. Le boxeur s'exécute, en se forçant un peu.

Thanks in advance for any help.