Not to over-flex

(original: Nepřeflexit)
verb
1. careless activity; do not exceed the literary maximual limit of Flex
2. the eleventh commandment; "You will not over-flex in front of the fellas, since the God of flex would punish you."

Guy1: "Dude, that was just so easy. First try bro, i don't know what was supposed to be the challenge here.
Guy2: "Be careful not to over-flex tho...
Guy1: *Fucks up in a spectacular way*