I recently received an automated email from @juan.garza of the Community Management Team.
Subject: Bicycles Stack Exchange — You're killing it.
Now my immediate thought was "what have I done wrong?" but no, I'd hit 100k points and this was a positive thing.
Perhaps this is a cultural, age, regional jargon thing but "killing it" isn't a positive statement globally.
Also, there are several SE sites where "killing it" could be taken wrong - parenting, martial arts, ukrainian-language, pets, latin, and any other language SE site.
SUGGESTION: can that text be updated to "you've hit a significant milestone" or "congratulations on hitting 100k rep" or something completely unambiguous.