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When someone thinks they're really clever because they make half their post or Tweet a hashtag. So they do it all the time.
Real life instances of "Hashtag's Disease":

I was home two hours late for curfew. Oh wait, #WHYDOIHAVEACURFEW

I AM IN BED SO EARLY AND IT FEELS SO NICE! #igothomebeforemyparentsdid #notabigdeal
by Screamin' Squirter September 21, 2011