Some of my non-geek friends in a friend circle with quite a few geeks of different flavours call this "geek butt sniffing".

I've been accused of it often, when I meet someone new (who's a geek) and we do what in my head is the "geek subject matter negotiation", where each side narrows down domain expertise and experience by doing a breadth first tree search across all shared geek-domains, followed by a depth first search down the tree paths with significant crossover.

One recovering-geek friend says we're going "Pshhhkkkkkkrrrrkakingkakingkakingtshchchchchchchchcch" at each other before deciding on a conversation topic and speed...