"She's pretty foul-mouthed. That's something from day one I was like, 'Wow!' Especially because she's so debonair and elegant, and then she has the mouth of the sailor.
"But I love her for the fact that she's always 100 per cent herself. She's one of the bravest people I know," Oyelowo told E! News.
When Theron was asked if her co-actor was right, she agreed but said she did not curse in front of her children.
"There are variations of it, mother f--ker, f--k you. There are many variations you can go with.
"I tend to say it under my breath. I know what my responsibilities are as a parent. It's not like the truck driver comes home. I've definitely stubbed my toe and said s--t or something like that and my kids are like, 'Mom!'" she said.
Theron shares son Jackson and daughter August with former partner Stuart Townsend.
The actor recalled telling the film's team, "Listen, we don't have a swear jar. This is how adults speak sometimes. One day when you're an adult, you'll get to speak like this. But not now.
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