chest beating 

1)Doing an action for the sole purpose of being a show off
2)Trying to outmatch someone else

Brotatoe 1: Bro! I can bench like 300 pounds.

Brotatoe 2: Dude! I can bench like 300 chicks!
Girl: Are you guys done chest beating? I would like to finish this game of Monopoly.

chest beating by BorkTheStork December 14, 2014

Beating the devil at chess 

Phrase used to describe an impossible task

"Mate trying to beat traffic on Thanksgiving weekend is like beating the devil at chess"

Beating the devil at chess by Paulo MaldiniPauloPPPOPOLiljse October 31, 2019