Question for all here.

I am part of a friend group that's all lgbtq and one of my friends classified me as a demi-boy. Even though I had it explained to me, I still don't know what this identity is. Please explain. Also for context, I classify as a bisexual(pref F) Cis-male but I don't entirely dress like the definition of masc. Sure I mostly dress masc but I sometimes rock female pants and occasionally do box-croptops. I have a hint of what it means but I still need ti be told

Edit: I still fully Identify as cis so far but also am not afraid to be super flamboyant/extra or emotional