Egg - a transgender person that has yet to come out of their "shell".
When a person first makes the realization that they might be transgender, it's referred to as "cracking your egg" in the trans community.
Also, in popular culture it's commonplace to say that a person who is in denial is "putting up walls", so an egg is like a type of wall that completely surrounds you. Cracking your egg involves tearing down those walls.