A sexual position wherein the male partner whilst penetrating from behind notices a brownish spec near the female's anus and, therefore, as in an investigation, procures his magnifying glass to inspect if the brown spec in question is leftover fecal matter or merely an unfortunately placed mole, and upon discovery that it is the former exclaims "oh dear," almost always in a British accent so as to hide the fact that he is disgusted.
Breh, I was Sherlock Holmesing this bitch and realized she had some leakage, but, nstead of just sending her home though, I did some critical thinking and realized a bitch that dirty a) is into anal and b) makes her own lube, so I went ahead and went to brown town.