A condition where the male partner in a relationship clearly adores or is simply in love with their current partners sister. Given the opportunity all those diagnosed with this condition would instantly embark upon a new relationship with the sibling, at the drop of a hat.
"Ssup, dawg"?
'"I've been a twot! 20 years and I'm still sistering for Nettie. Poor Rene never stood a chance and she's a fucking shrew while I'm at it".
"That's harsh, Bred".
'"I've been a twot! 20 years and I'm still sistering for Nettie. Poor Rene never stood a chance and she's a fucking shrew while I'm at it".
"That's harsh, Bred".
by zebraboy777 May 18, 2016
Get the Sistering mug.little sistering: the act of gaining interest in something purely because someone else is interested in it, then rapidly losing interest as soon as you get to do it. Sometimes this is followed by the other person losing interest as well.
I was little sistering my boyfriend the other day. He had played skyrim for about a week until I whined that I wanted to play. Once it was my turn I only played for an hour and then lost interest. But since I broke his stretch of playing he hasn't played it since either.
by TheOneTheOnly-Superman September 7, 2012
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