The act of pleasuring oneself by thrusting the erect member between a generous pair of bristols. Typically concludes with the delivery of a pearl necklace.
Phwoaar! She'sgot a shirtfull. I'd love a good titwank in those.
A fusion of the already very expressive words twat and wanker to describe a peculiar, even unique, kind of contemptibleness found in those who are both stubborn and awkward, awkward and stubborn.