When you are pooping, a Matt La Placa is that little piece of crap that gets stuck to your ass hair. No matter how violently you shake your booty it just won't fall off and plop into the toilet. The person will then have to reach into their crack and pull the Matt La Placa out of their anal hair manually. Sometimes Matt La Placas are encountered that are SO BIG that pliers are actually needed, although this is not a common occurance.
This morning I pooed and peed but a Matt La Placa was stuck gripping to my hairy butt cheek.
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