Bogus means fake. A bogus dollar bill is counterfeit, a bogus Picasso was not painted by him, and a bogus attempt at reconciliation would come from someone who never intended to end a fight.
The word bogus originated in the U.S. It was coined as a name for a machine that printed counterfeit money and later became a trademark term among California surfers. In surfer speak, "totally bogus, dude" would describe any unfortunate situation.