M test

The practice of a woman or girl falsely claiming that she is an M male at the beginning of an anonymous online chat to determine whether the guy she is interacting with is only talking to her because of the possibility she might be a female with whom he could be sexting or engaging in sexual activities.

Girl 1: Hey, so have you found anyone interesting on that anonymous app so far?
Girl 2: Well, I found a guy who seemed so chill and said he was looking for genuine friends, but he failed the M test.
Girl 1: You told him you're a guy to see if he's legit? You're so sneaky, lol.
Girl 2: Yeah, he ended the chat immediately after that. Oh well, he was probably just some creep who preys on girls like me anyway. "Just looking for friends" my ass...
Girl 1: An ass he should be regretting not having a chance to see, haha.
Girl 2: Shut up, haha