tip the middle finger:

To masturbate , said of and by females. See masturbation-female for synonyms.
See Also: Abigail, afghan, aunt Mame, aunt Mathilda, bell ringers, bell-end (of the penis), big bird, buttered finger, coitus inter digitae, Daisy Dumpling, digitus infamis, finger, finger fuck, give it away, glans clitoridis, glans clitoris, K-Mart crowd, longer and linger, looky-loo, middle age, midsection, penis length, stink-finger, stinky-finger, sugar finger, tawse, tenpin, thelemassation, throw a bird, tip out, tipout, toby finger (salute), toby salute, turkey-trotter, white-haired bar

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