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To authoritatively, and in a masculine manner, make a prediction based on nothing other than belief - guaranteeing that the predicted event never occurs. Often characterized as the result of "mansplaining".
My boyfriend told me we'd definitely be upgraded to business class....but he totally manjinxed it, and we wound up in the back of economy.
manjinx by LingualEpiphany October 29, 2023
Related Words
One who has an ultra-sensitive and extraordinary large Vagina. Daily tasks for a person with a Manmina can be Daunting and incredibly sternums on your eyes. Doctors can’t explain this 1 out of 100,000 growth but say it exist only on Long Island. Since its rarity and geographic location sightings are rare but every so often if you look out into Hempstead Harbor and beyond the sound you can see such a sight.
I was walking down to the Dock when my Manmina had an itch.

I was swiming in the harbor when a Ginat Manmina came sailing by.
Manmina by GCsailboats April 23, 2011

manminder 

Manminder can do anything as he is king of mind and he is a good controller
manminder by anonymous November 23, 2021