E-boy means: A male member of the e-girl/e-boy subculture which emerged in the late 2010s, characterized by emo- and grunge-inspired fashion, and by heavy use of social media platforms (notably TikTok).. It is internet-era slang, commonly seen on TikTok, Discord, Reddit or X. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.