More detail on the "wanker" hand movement. Place thumb against closed fingers to form a "tube". Raise arm with the hand's "tube" held vertical. Move hand up and down (most commonly with a wrist movement). (If you're male, the actions are probably fairly natural ;-) It's a common sight in Britain, particularly amongst irate car drivers who've just been cut up, or from ppl outside a pub trying to start a punch-up.

There's a similar movement popular amongst kids, for "dickhead". Same movement, but imagine you're stroking a unicorn horn (or some kind of horn anyway ;-) coming out of your forehead.

A very minor and childish one in Britain is "making long bacon" at someone (I didn't learn there was a name for it until quite recently). Put thumb on nose, extend fingers vertically, and wiggle fingers (usually whilst sticking your tongue out). I have no idea where this came from.

Graham.