"The Big Bang Theory" cutie Kaley Cuoco stopped by to chat about tattoos -- telling us that her usually conservative dad recently got inked and is quite proud of it! Plus, she showed off her own... a Chinese symbol for faith.

"It's a tramp stamp," Kaley laughed. "I forgot about it, too. It's been a long time." Kaley was only 17 when she got inked. "I was trying to be cool," she explained. "I know, so dumb… but, I forgot I even had it. It's way far back there. It's kinda far back. It hurts my neck now to see back there."