If the issue had been raised for discussion in general business, I would have made the point that I cannot remember hearing the expression before Prince Philip, the Duke of Edinburgh, told British businessmen that it was time they pulled their fingers out about 50 years ago (when I was finishing secondary school). He was reported as saying:
‘Gentlemen, I think it is about time we “pulled our fingers out” … If we want to be more prosperous we're simply got to get down to it and work for it. The rest of the world does not owe us a living’: Speech in October, 1961.
I am not sure that mentioning Prince Philip would have been persuasive, however, since the role of members of the royal family in setting social standards is now less widely accepted than it was 50 years ago. Given Prince Philip’s reputation for making social gaffes, some members of our club would possibly consider him, also, to be too rough around the edges to be voted as best speaker.
How can we judge whether or not ‘extract the digit’ should now be viewed as a socially acceptable use of language? It might be relevant to consider whether use of this expression still ranks amongst Prince Philip’s biggest social gaffes. It doesn’t. It is not even included in this long list compiled by BBC news.
A Google search for the phrase ‘pull your finger out’ reveals widespread current usage in Australia. The contexts suggest that it is usually intended to be offensive, but I think most people who are told to pull their fingers out are more likely to be offended by the implication that they are wasting time or procrastinating than by the vulgarity of the expression.
The origins of the expression do not necessarily support a vulgar interpretation. One theory, noted here, is that the expression originated during the times of the Men'o'War. When a cannon was loaded, a small amount of powder was poured into the ignition hole near the base of the weapon. In order to keep the powder secure before firing, a crew member pushed one of their fingers into the hole. When the time came for ignition, the crewman was told to pull his finger out.
Perhaps the apparent vulgarity of the expression lies solely in the imagination of those who think that the metaphor must refer to removal of a finger from a bodily orifice.