Back in like early-mid 2010s, I saw it (and e-boy) used to indicate anyone on facebook with micro-celebrity status, usually with the implications of the followers being largely simps. Then around the late 2010s, I saw it referring to young people who were doing online long distance dating on platforms like discord, maybe some twitch streamers, as well as the previous definitions.

Then early 2020s I saw it transform into a fashion style indicating a weeby terminally online girl as you said (whether it was sexual or not), usually artificially or exaggerated to build a brand and online following. But it also became expanded to include girls who posted sexual/sexbait content regardless if they had any specific aesthetic.