In online 3D first person games like WoW, Call of Duty, Battlefield, Second Life etc, where a person instead of paying attention to the conversation or what they should be doing, instead just cams around themselves to get a better look at their avatar in a very narcisstic way.
Jack: Dude I need help killing this team of orcs. Stop glam camming yourself and come help me
Joe: Yeah it's just that my chick avatar's butt is so cute. I am a glamcam addict.
Jane: Are you listening to me?
Jane: facepalm. Oh you were glam-camming... duh.