comment term for when a spy saps your sentry, or dispenser. It is also you when a spy back stabs some one close to you with out harming you in the slightest. Spy in my boot is used comically when a spy is a returning problem. Other similar phrases are "there's a spy in my soup, oatmeal, or gahhhhhh"
Demo man: That damn spy has terminated half our team, and destroyed our convenient support systems produced, and distributed by engis."

Sniper: "Watch behind your back!!!!"

Demo man: "Gahhhhhh!!"

Sniper: "damn it there's a spy in my boot."
by mega_madness August 8, 2009
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