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An unbreakable promise, one ensuring absolute truth. The validity of the promise is kept by mutual trust between two parties. One keeps a tadewo mainly in hopes that, in the future, the other party will keep it as well.

For example, Charlie makes Elliott tadewo that he Elliott will pay him Charlie back. Elliott keeps this promise to ensure that Charlie will stay faithful whenever he promises something through a tadewo in the future.
Charlie: Dude, I just saw a guy get run over by a truck.

Elliott: yeah right.

Charlie: No really! I Tadewo!

Nick: I got arrested last night.

Ben: You Tadewo?

Nick: ugh, no.
by ep04 December 22, 2008
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