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Someone who has a lot of the same interests and similar personality type. If you two were to bang it would be a cosmic event. You and your cosmic twin would be a great couple if you ever got together even though this would probably happen when you two are in your late 60s-early 70s
Gimli: "Yo, Aragorn and Arwen look so cute together!"

Legolas: " I know! They have so much in common too! They must be Cosmic Twins!"
by Morphyne June 30, 2015
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Jul 2 Word of the Day
Someone people turn to when they're sad who makes them feel better.
Dude, I was so unhappy about my girl, until I spoke to my serotonin donor who really helped me feel better
by jonfurstn1 November 27, 2009
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