The 28-year-old took to Instagram to call out the unidentified man whom she claims made nasty remarks about her figure during the incident in Scunthorpe.
A furious Chanelle wrote: "Whichever absolute d*ckhead just reversed his car into me... when I was walking along doing absolutely nothing wrong... try looking where you're going in future.
"And if u do happen to reverse into someone again, maybe just say sorry instead of calling me a "fat c**t who needs to get my arse to the gym."
"Learn how to drive, learn some manners and tell ur smug girlfriend who was laughing at me in the passenger seat that she's the one to be laughed at being with a complete nob like you!!!! Rage!!!"
Chanelle found fame in Big Brother back in 2007.
She has a six-year-old son named Blakely.
Chanelle has always been very open about her weight and size. She appeared on ITV's This Morning in April to say she was happy at her current size, because she was irritable and angry when she was slimmer.
"I have to set an example to Blakely, so I eat in moderation. I don't binge all day. My body is just more sensitive to food than others. I would rather he would see me eating carbs and not miserable and snapping at him," she said.
"I have put weight on, I don't think I look hideous, I think I look nice."