Paul Hutton, 40, was pulled over by police as he drove an electric Barbie car, which moves slower than a mobility scooter, near his home in Essex.
Mr Hutton, who has four children Simon, 17, Calum, 14, Laina, 12, and John, 11, admitted being a ‘complete twit’.
Speaking after the hearing at Colchester magistrates court, he said: “You have to be a contortionist to get in, and then you can’t get out.
“I was very surprised to get done for drink-driving but I was a twit to say the least.
“It is designed for three-to-five-year-olds.
“Originally it was a pink Barbie car but I put bigger wheels on it but it’s not fast.
“I’m not unhappy with my punishment, just a little bit surprised.”
Mr Hutton, who is divorced, is a former RAF aeronautical engineer who now studies electrical engineering at Colchester Institute.
He explained: “I’m in the third year of my electrical engineering course and it was a little project I was doing with my son who is doing a car mechanics course.
“When it was done I couldn’t resist the temptation to take it out.”
Mr Hutton, was found to be twice the drink-drive limit, he said.
Appearing before magistrates last week, he admitted driving the toy car while drunk.
He was given a mandatory three-year ban because he had received another drink-drive ban within the past ten years.
Magistrates also gave him a 12-month conditional discharge and ordered him to pay £85 court costs.
Chairman of the bench Neil Munson said: “This is most unusual.
“I have never seen the like of it in 15 years on the bench.
“The vehicle is not even capable of doing the speed of a mobility scooter and could be outrun by a pedestrian.
“Taking this into account, we feel we can impose a sentence of a conditional discharge for a period of 12 months.”
The car was confiscated by police until the hearing but Mr Hutton now hopes to get it back.