Nerding Off

When your talking to a person and they start going off about a comic book hero or video game and all you can do is nod and pretend you understand what they are saying

Girl 1: Hey! how was your weekend?
Girl 2: Oh fun. i was busy dodging lightning bolts in the thunder plains

Girl 3: wha...?
Girl 2: Oh you see i have to dodge them 200 times in order to get the venus sigil and... (blah blah blah)

Girl 1: oh look there she goes nerding off again