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Definitions by Titanium Ukrainian

thrum bone 

The act of forcing ones thumb into a partners rectal passage, without the act being discussed or pre arranged.

There is a high chance that this act is will be made by a opportunist and stealthily approached.
"Hey Pash whats that over there?"
"oooooh my god what the fuck was that?"
"i just thrum boned you dude!!!"
thrum bone by Titanium Ukrainian January 6, 2008