The One With Joey's Dirty Day - S4-E14
Corrected entry: Phoebe goes to Rachel, and to comfort her says "Ah Pheebs," and acts surprised when Rachel tells her that Pheebs is short for her name and is not just what they call each other. However, in the previous episode, The One With Rachel's Crush, Rachel says "Mr. Pheebs" and we see Phoebe obviously happy that Rachel has used her nickname as her false identity.
Correction: I agree, she reacts to it being used on her behalf as she also gestures to herself, she also answers to this nickname in many previous episodes before this statement is made and although the joke is funny they would have been better off using it earlier than season 4.
Correction: How do we know what Phoebe's happy about? Perhaps she just thinks it's a good choice, given that (to her way of thinking) it's a pet name the girls use for each other.
STP ★