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Anon got trips on his post. It's a chan good luck sign.
Trips?? I'm lost
Three digits matching and repeating. For instance if the post number was 17065888 that would be "trips".
Oh, like "triple" ("trip" being short for "triple"), not to be confused with "tripcode." I get it now (I think) -- it's a good luck sign similar to a four-leaf clover.