Well, let's ask the man, himself ...
According to the Urban dictionary, a "Quigley" is a British Army slang term for using one bullet from a sniper rifle to take out two targets at the same time.
Now, if you're looking for a sexual connotation to this ... hmmm ... maybe this?
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As an added bonus, Mr. Quigley says THIS is a "Stacey" ...
The essential American soul is hard, isolate, stoic, and a killer. It has never yet melted. ~ D.H. Lawrence