A person free of apparent sexual classification traits including but not limited to facial hair, breasts, Adam's apple, and gender-specific clothing. Derived from the customary question to other onlookers: Male or Female?
Note: This term does not imply that the allegedly gender-neutral person can tangibly "morph" from one sex to another, but only that they may appear to modulate in gender over time.
Randy: "Miguel, is that a male or female?"
James: "He's definitely a...wait, she's a woman...maybe..."
Miguel: "No, actually, I think it's a MorF."