From the Modern Drunkard Magazine’s Wingman’s Handbook (thanks to Karl for pointing it out):
There’s much more to the task than distracting the [cock-blocker] while the [flight leader] makes his move. Wingman skills have been honed and passed down since someone decided women should be allowed into bars. Strategies have evolved and tactics have been polished to the point that the wingman has become a super-specialized warrior in the eternal Battle of the Sexes.
The handbook is an invaluable guide to that most noble and self-sacrificing job. Wingmen, I salute you.