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 14, 2006
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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
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If your SO is annoying, ungrateful, and overall an useless person, you call them your Insignificant Other.
"My boyfriend does not do any chores. He is my Insignificant Other."
"Shut up Carla, I only said I won't wash your undergarments"
by PseudoWarrior07 January 13, 2022
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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
Get the Insignificant other mug.
something you say to somebody when they can't find the answer to a painfully simple problem.
gee man, I cant seem to find the answer to this math problem!
<Its 1+1>
YOU PUNY INSIGNIFICANT MORTAL!!!! THE ANSWER IS CLEARLY 3!!!!
by Nukes.io February 15, 2020
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