1. play doctor - Noun
2. play doctor - Verb
play doctor (plural play doctors)
A professional who is called in to revise a play written by someone else.
To pretend to be doctor and patient as a form of child play.
(sexuality, usually of minors) To explore or sexually engage with the another person's genitals or anus, particularly in the context of roleplay of a medical nature.
Source: en.wiktionary.org