An affliction commonly occurring in nerds that causes them to join nearby conversations uninvited. This normally occurs when the conversation is about a topic the nerd has some knowledge of.

The effects of nerdrettes can be suppressed with force of will, but many nerds lack the social grace to do so.
Man: Those people attending the game convention across the street seem to be all dressed up.

Woman: Yeah, it must be some sort of shooter game thing - see how they all have plastic guns?

Nerd: They're cosplaying as characters from the game Valkyria Chronicles. It's a turn-based military tactics game for PS3.

Man: We weren't talking to you.

Nerd: Sorry, my nerdrettes got the better of me... Do you want some Pocky?
de Kinzel 5 septembre 2010

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