Anand Singh was driving past a bus load of French schoolchildren who were on an exchange trip to the UK when they spotted him sitting at the controls of his car without any clothes on, the Canterbury Crown Court was told.
"The defendant was completely naked - he roared alongside the coach while abusing himself. He pulled alongside the bus before reducing his speed and making eye contact with witnesses on the bus. These included a number of children who proceeded to film him using their phones," prosecutor Robert de Banzie said.
Judge Adele Williams told Singh - "What you did on these occasions was selfish and irresponsible".
The 37-year-old was caught when police got the registration number of his BMW from photos taken by the French schoolchildren on their mobile phones.
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The court also heard how Singh exposed himself to passengers on a Stagecoach bus on the A2 motorway from Canterbury to Dover just a week before the incident involving the schoolchildren.
He had also received a police caution in April this year for indecently exposing himself a third time in his car.
"He was struggling with a number of events in his life including a marital break-up and three bereavements within 12 months," he said.