Wiktionary
a. 1 (context idiomatic slang of a person English) dead, killed 2 (context idiomatic slang English) broken, completely failed so as to become inactive
Usage examples of "toes up".
By the time they slashed the air with polearms and swords, their quarry had risen out of reach, though Byron pulled his toes up.
There were some people so allergic to the little critters, one bite would make them go toes up.
The leg circles by first lifting the ball of the foot, and then the whole foot, and a step is taken that rolls forward in the air and ends on the heel, with the toes up, as the body leans forward, creating pressure on a muscle on the front of the left calf.
He grabbed the end of the stainless steel tray and slowly rolled it toward him, so that the first thing I saw was Grandma Mazur's shoes pointing toes up, then Grandma's bony shin, her big blue coat, arms rigidly at her sides, hands hidden under the folds of the coat.