loser's limp
An ailment or impediment, typically manifested through injury, that is feigned or exaggerated by a competitor to explain a poor performance
A: "Federer is one set and a break ahead now but his opponent has started to clutch at his hamstring after each rally, "
B: "Looks like he's getting a bit of a loser's limp."
B: "Looks like he's getting a bit of a loser's limp."