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The result when you and your best friend do something immensely awesome and defining of a best friendship together. Also the result of recollecting or reminiscing of how awesome you and your best friend are.
1. "Dude, I just heard Man In The Box on the radio and got a bestfriend boner remembering that time we sang it together in Poli Sci."

2. Tim and Justin will forever remember the night they got bestfriend boners, after catching the house on fire at a party.
by Daniel Caldwell November 08, 2013
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Jun 5 Word of the Day
A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.
17th Century setting: Due to his treatment of the "French Pox" (syphilis) with mercury a merkin Gwendolyn used a Merkin to used to hide the side effects of hair loss and not alarm her husband.
by David W. Tuthill December 30, 2005
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