Darren Till said a knockout in bare-knuckle fighting is better and feels "more pleasurable" than a stoppage in MMA or boxing.
Till will fight fellow former UFC star Yoel Romero in the Bare Knuckle Fighting Championship -- Till's second bare-knuckle fight -- in Manchester, England, on Saturday.
It comes after he recovered from a knockdown to stop former "Geordie Shore" star Aaron Chalmers in his debut in the sport in May.
"[It was] unbelievable. People were telling me [about the feeling], but when I landed it and when I felt it and how it feels ... One of the most exhilarating feelings on earth," Till told ESPN.
"I don't think you can get any bigger high than stuff like that. It was a truly phenomenal feeling, and I can't wait to feel it again Saturday night, if I'm honest.
"It felt more pleasurable, which sounds psychotic."
Till vs. Romero: How to watch in UK, start time, BKFC rules, weight class
Till, who beat Anthony Taylor, Darren Stewart and Luke Rockhold during his boxing stint, has become a major draw for BKFC, with upwards of 15,000 fans expected to attend Saturday's fight at Manchester's AO Arena.
"I just think it means that me and Yoel ultimately carry star power," Till said. "I obviously carry star power here in England, which is nice. I've been fighting a long time. People are still willing to support me. ... And it also speaks a lot about the bare knuckle, how they are becoming a little bit more of like a homegrown brand.
"People who wouldn't usually tune into stuff like this are tuning in ultimately. ... So, it's a warm feeling for me."