When 2 people start a relationship online, extremely common on Discord and VRChat (and Roblox but that's honorable mentions)
Jessa: Have you heard about Billy? He got into a relationship but its E-Dating
Willow: What does that mean?
Jessa: He met her on some Discord server. she lives all the way in Europe!
Willow: Damn, he finally found a girl who'll date him IN EUROPE
A person with this gender identity can feel like a different gender in different circumstances or different places, including but not limited to online.
"They are a boyonline but they identify as a girl in real life?"
"Yeah, there Yaegender"