Ballin'

Ref. in COBCS (Conan O'Brien Can't Stop, documentary film of his tour after the end of The Tonight Show and before Conan) - Sona (Conan's assistant) uses the word whilst on the phone to her mother (describing herself as a 'baller' on the plane that they were on). Conan doesn't understand the word.

Similarly, later on, he frequently uses the phrase 'we're going to hit it and quit it' - in the commentary, Sona mentions that she had to explain what this meant, because he didn't understand the sexual connotations of the phrase.