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Wait till they start making out. Then you pull your pants down and jerk-off. Bonus points if you can manage to drool a bit and grunt a few noises.
I suggest, "Grrhhh. . . gurgle, gurgle." Another one that seems to be popular is "fa la la la!!" . . . And if you can make it work, "Slinka dinka minka dee. Flinka tinka binka taa.
qft!!
On a serieus note though: Forget about her being your gf. Your in the friendzone now, and from what i can make out your also pretty close as friends. If so, then she won't even think of you as a potential mate.
Focus on other girls, be alpha, dance with them. Show you can have a good time with any girl you want. The other girls probebly love dancing with you because you're pretty good. Not just because you got a friend you always dance with.
But if you're really crazy about your friend, then I suggest you try outgaming him. And read up on 'how to get out of the friendzone?' stuff.