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3.
Friend with benefits.
Sophie: Are you and Brian officially a couple?
Nadia: No, we just hook up occasionally. He's my insignificant other.
by Flanhoodles April 16, 2008
11 6
 
1.
Someone you are casually dating, while seeing others on the side. This person is almost always someone you would never consider dating exclusively, but, you keep around as a backup plan for free Saturday nights.
Maria: Oo, the new guy in Calculus is cute!

Virginia: Wait, I thought you and James were dating?

Maria: No, no, we're just insignificant others.
by Madelaine June 13, 2006
50 29
 
2.
a phrase used to describe the cunt or douche that you used to officially have a relationship with that is still part of your life for whatever stupid reason that you're coming up with.
I took my (in)significant other to lunch yesterday. Not five minutes had passed before she was correcting my grammar and telling me that I was eating with the wrong fork. I LIKE THE LITTLE FORK.
by Milowe October 21, 2010
8 2
 
4.
Someone you are casually dating, while seeing others on the side. This person is almost always someone you would never consider dating exclusively, but, you keep around as a backup plan for free Saturday nights.
Maria: Oo, the new guy in Calculus is cute!

Virginia: Wait, I thought you and James were dating?

Maria: No, no, we're just insignificant others.
by Madelaine July 11, 2006
7 13