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2 definitions by Naja

 
1.
1. A kind of fanfic which has a happy ending or generally happy content, rather than smut (pornography) or angst (sad stuff).
'I wrote some fluff' OR 'that fic had a lot of fluff in it.'
by Naja May 23, 2006
 
2.
To have diarrhea. To go to the bathroom and evacuate your bowels in liquid form.

It can also be used if you have a lot of belly pain and have to go constantly to the bathroom for number two.
Poor Mary, she has the shits.
My cat had the shits last night.
I think I have the shits.
by NAjA November 26, 2013