Bogus means fake—a bogus dollar bill is counterfeit, a bogus Renoir was not painted by him, a bogus attempt at reconciliation would come from someone who never intended to end a fight.
Perhaps appropriately, the word bogus originated in the US. Coined as a name for a machine that printed counterfeit money, it later became a trademark term among California surfers. In surfer speak, "totally bogus, dude" would describe any unfortunate situation.
