In seinfeld "The pick" episode,
GEORGE: So the minute I started up the steps to her apartment I knew I made a terrible mistake. Going back with her. So we're in her apartment she goes into the bathroom. I'm cursing myself; now how do I get out of this? Then it hits me like a bolt of lightening. The pick.
JERRY: The pick?
ELAINE: The pick?
GEORGE: She comes out of the bathroom, I'm in up to my wrist. You should have seen the look on her face.
What does George mean by "I'm in up to my wrist", it's not about picking nose, is it? How can picking nose be as deep as up to one's wrist? Then what is it?