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1.
A soul-mate in friend form.
Susie: Hey Mary. You're like, my soul-mate in friend form. You're my FRIENDMATE. <3
by rachflam April 15, 2010
 
2.
A roommate or housemate that has become more than just someone you live with by actually evolving into one of your friends.
Yeah man, I can't go out to the bar with you tonight, I'm chillin' with my friendmate.
by Immy1987 September 16, 2007