The 20-year-old passenger said the man claimed her busty cleavage was distracting him when he looked in the mirror.
He reportedly stopped the bus in the southern town of Lindau and said he could no longer concentrate.
The driver then told her to sit somewhere else — otherwise he would throw her off the vehicle.
The sales clerk, named Debora D., said she moved to another seat but felt humiliated by the driver.
Recalling the incident, the woman told reporters: "Suddenly he stopped the bus.
"He opened the door and shouted at me 'Your cleavage is distracting me every time I look into my mirror and I can't concentrate on the traffic.
"If you don't sit somewhere else, I'm going to have to throw you off the bus.'"
The best part is that the company is defending this guy.A spokesman for the bus company has defended the man behind the wheel.
He said: "The bus driver is allowed to do that and he did the right thing.
"A bus driver cannot be distracted because it's a danger to the safety of all the passengers."