ebay bedroom warrior
A person who sells items on ebay or by other means over the Internet operating from their bedroom.

This persons online selling appearance is normally that of a larger company or someone operating from larger premises.
Person 1 "You fancy coming out for a few drinks tonight?"

Person 2 "Sorry I can't I have to pack up a load of parcels for stuff I sold online from my bedroom"

Person 1 "You are such an ebay bedroom warrior"