"Time flies when you got a gun in your mouth. I mean -- time flies when you're having fun."
Nash's co-host, Sean Oliver, was quick to denounce the morbid comment ... replying, "Don't play like that. You have guns, so you can't say those things."
But the 63-year-old doubled down on his statement ... saying, "I can do whatever the f*** I wanna do. Long as I leave a note."
The conversation changed to how Nash is actually coping with the tragic loss -- the wrestler says it's much easier to tell everyone he's doing fine .