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1.
A friend you don't mind fucking in the butt once in a while. A really good friend
Who sarah? Nah you can hit it anytime, we're just fuck mates. Oi does she fancy a poundin'.
by yellow juicy girl September 18, 2007
 
2.
noun, a sexual partner

A copulation always requires a partner, and such a partner (or probable partner) receives several names. Please note that mate means colleague or also person with whom someone shares something. Thus, if two girls have the same loverboy, they are fuckmates (they share the same fucker) also.
Well, Monica, it's visible that you need a good fuckmate urgently.
by Tiago Zuhr August 25, 2008