Charlie Sheen left quite an impression on Jimmy Kimmel after his surprise appearance on the comic's ABC talk show Monday.

"We had a very very famous surprise walk-on guest tonight. My head is still spinning," Kimmel tweeted after the two kissed on-air. "Legend has it that if Charlie Sheen kisses you at midnight, you turn into a whorewolf."

Sheen's take on the lengthy lip-lock? "Your lips are very moist," he told Kimmel, 43.

The former Two and a Half Men actor, 45, then gifted several audience members (and scheduled guest Mark Cuban) with "Winning" and "tiger blood" T-shirts before presenting Kimmel with a mug. "It's got a fox on it," he explained.

"Why the fox?" Kimmel asked.

"I'll let you figure it out," Sheen said before exiting the stage.

(According to reports, Sheen met with several FOX executives last week.)