Ronda Rousey -- Carl's Jr. Ready for Round Two ... After Record Sales

Ronda Rousey is crushing the fast food world about as quickly as she does MMA opponents -- her sexy commercial has Carl's Jr. grill jockeys slangin' at near record levels.

Our sources over at Carl's Jr. tell us Rousey's spot for their Cinnamon Swirl French Toast Breakfast Sandwich boosted sales almost immediately. They didn't want to give up specific numbers, but one source said the campaign "far exceeded" all goals.

The ad's been running nationwide for less than 2 weeks, and we're told it already has more than ONE BILLION media impressions. That puts Ronda in the same lofty neighborhood as the brand's other sexy spokesbabes Paris Hilton, Kim Kardashian, and Kate Upton.

Of course, Ronda could crush them all ... at the same time. With one arm.