What is Furnace Filter?
1.
While performing sexual relations in the ever popular doggy-style position, said male retreives his dirty underwear and at the perfect interval, stuffs them unexecpectedly in her mouth as she moans. Timing is crucial in this act. A quick getaway is sometimes needed. It is required by man-law to tell all friends when this has been properly executed. Thanks JP
"Cody told me he pulled off a furnace filter last night after bar time with that milf from next door. Awesome"
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See dirt, dick, asshole, dirty, grimey..
1.
Insult simular to "your mother" but more insulting because your not only insulting their mother, your instulting all their mat..
