The reality star, 32, appeared in the 2016 series of the show alongside disgraced Stephen Bear, Christopher Biggins and radio DJ James Whale.
She finished fourth and famously had a romance with ex-Towie star Lewis Bloor inside the house, but the relationship ended just months later.
Recalling her time on the programme on the Saving Grace podcast, Marnie said: “It’s the easiest money I’ve ever made. All I did was smoke fags and sleep. But obviously I had a really public relationship in there and it ruined my time in there a little bit.”
Marnie was said to have received a five figure sum to take part while Biggins was the highest earner of the season bagging £150,000.
The star then revealed she’d “100 percent” go back onto the programme, which is being rebooted next month on ITV, if she was asked.
Revealing what she’d do differently, she said: “When you reach your thirties I think you don’t care as much about trivial things and you do just speak your mind more.
“If I went in now I think I’d be much more open. Back then, when I was in there, there were little things I was hesitant to say. If I did something like that now I think I’d walk in there and be a boss.”
Marnie then joked she “couldn’t live down” a raunchy shower scene with Lewis from her series but hoped that it would be buried in online history by the time her kids were grown up.
The Geordie lass is now happily married to Casey Johnson with who she has two kids – Rox, four, and Oax, one.
The family appeared on the explosive latest series of Geordie Shore, which was much more difficult for her than CBB.
She and Casey have been parent-shamed by trolls on social media for being “too laid back” with their eldest, and Marnie clashed with co-star Charlotte Crosby too.
In a lengthy post, Marnie wrote: “Just want to say a huge thank you for all the support I’m receiving. It’s so upsetting to see comments being made about my four-year-old son, Rox is a hyper four-year-old but aren’t most kids his age, he was just excited to be away.
“Rox’s ADHD doesn’t change how amazing, loving, funny and caring he is.
“He’s an innocent child and doesn’t deserve this, he was just having fun.
“For close friends basically saying hurtful things about him has destroyed me as a mother, I really wish I didn’t involve him and subject him to this negativity.
“I wouldn’t dream of saying hurtful things about children.”
The TV star explained that she felt “constant” pressure while filming with her family and said it was “evil” that close people around her had “judged” her and her kids.