Sniper's Nightmare 

Used to describe a person who walks with their entire body moving side to side since they typically have one dead leg. The phrase “Sniper’s Nightmare” alludes to the difficulty a sniper would have in assassinating them if they were the intended victim.

“Old Sloppy Tony is a total sniper's nightmare the way he walks!”

Sniper's Nightmare by gary69_ August 30, 2022

sniper's nightmare 

A very, very thin person.

"Look at that Paris Hilton! She's a sniper's nightmare!"

sniper's nightmare by afei February 12, 2004