The phrase "act the masseuse" refers to someone who pretends to be a professional masseuse and provides therapeutic massage services without proper training or certification. Synonyms for this phrase include "pose as a masseuse," "impersonate a masseuse," "fraudulent massage therapist," "phony masseuse," "unlicensed masseuse," and "imposter masseuse." These synonyms all imply that the individual is not qualified or authorized to offer massage services and may be engaging in a deceptive or illegal activity. It is important to seek out a licensed and certified masseuse for safe and effective massage therapy treatments.