The 2010 contestant, who was fired at the interview stages, has dismissed the current crop of candidates and Ma came in for particular criticism.
"I'd rather have my actual testicles rubbed up and down a cheese grater than have to even look and speak to her. She's so whiny," Baggs told Digital Spy. "She's always whining."
Baggs also claimed that he hadn't been won over by Jim Eastwood, arguing that "it takes a little bit more than Irish charm to turn the Baggs around".
"If [Jim] wins, I'll give everyone who reads this a million pounds," he said.
He described Helen Milligan as too corporate and professional for his tastes and joked that having to comment on Natasha Scribbins was "like choosing between chlamydia and gonorrhoea - they're both pretty average".
The Apprentice airs tonight at 9pm on BBC One.
> 'The Apprentice' Final Five: Stuart Baggs 'The Brand' gives his verdict
> 'The Apprentice' Episode 11: Fast Food Task Preview
See preview pictures from tonight's Apprentice below: