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The act of putting your finger up someones back c*** (bumhole) and then inserting that finger into that person mouth via fish hook method

(this is rather like the RUSTY FISH HOOK, however this method uses the victims bum aswell as mouth)
It was early in the morning, tom and jack were lying together semi naked. Whilst giggling, jack casually... BUMMOUTHED tom

After the BUM-MOUTHING, tom was visibly shaken and had to lie down
by Joedude20 September 27, 2010
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