After they left the office, Peabody shoved her hands in her pockets. These nicknames are pissing me off.But you're not I'm-Too-Good-to-Pee-Body. Harris is.It's damn name. And now I have to pee. It's like my bladder has to prove something.Pee at the bank. Consider it a deposit.
After leaving the office, Peabody feels frustrated by the nicknames being used, particularly the one referring to her as "I'm-Too-Good-to-Pee-Body." She finds it irritating and thinks it reflects poorly on her. This irritation is compounded by a pressing need to use the restroom, which she humorously thinks is a way for her bladder to make a statement about the situation.
Peabody's annoyance leads her to contemplate the absurdity of her situation, even considering making a joke about using the bank for her needs by calling it a 'deposit.' Her inner monologue captures the mix of humor and irritation she feels in response to the nickname and her current predicament.