A "fool catcher" is any item or device used to give away the unwanted entrance to a place or to go into an area which is restricted or be used when not authorized. In "Thunderball", James Bond puts a hair across the bottom of his hotel room closet to see if the door gets opened while he is away. Other fool catchers are bottles tied together with fishing line on a staircase, a bell or a can of nails placed on a windowsill near the catch which will fall and make noise if the window if opened or greasing the handle of a questionable knife - if it later shows a print, it was used; if it's clean later, it was used.
He tried to sneak in through the window, but the fool catcher gave him away. Or

I told her to stay out of my stuff, and I later saw the fool catcher was gone - she went in my stuff anyway.
by hiwaychild July 18, 2018
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*looking in bra and underwear drawer*
Man it looks like I need to buy myself some new cream catchers”
by Ermmaeads July 13, 2021
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A noun for a person whom presumably enjoys catching seeds, or at least most minimum, attempts to catch seeds, whether it be a bag, net or mouth as the catcher.
by Izzyburgh February 21, 2016
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Someone who goes out without a mask in order to catch the common coronavirus.
Too many Disease-Catchers in the store. I’ll go this evening.
by Kim song dune August 16, 2020
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