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A way to describe your relationship with somebody who you originally met doing a geeky hobby (such as trainspotting, roleplaying or a science fiction fanclub), whether you still participate in that hobby or not.

It is a good way to answer awkward questions without having to, for example, describe to your new girlfriend what Magic: The Gathering is.
"Where did you guys meet"
"We're geeks-in-law"
by Ian Taylor May 16, 2006
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