It is believed that this comes from the rhyming slang Hampton Wick, whereby 'Hampton' is used to refer to one name for a part of the male anatomy which rhymes with 'wick'! As such, it is just a variant of the other similar phrase in which one says something or somebody "gets on my.....'"and the next four-letter plural word refers to parts of a woman's upper anatomy.
Spection...locution...schmocution...what the hey! It was a nice compliment, H. Thank you. It's just a shame that one even has to go in for these shenanigans, in order to make a point because of the over-zealous censor settings. I'm always reminded of Les Dawson, in apron and headscarf and hitching up his ample bosom, whilst leaning over the garden fence and talking about bodily features!
Many years ago, when working as a Work Study Man. I had to study the job being performed by a young man of about 19 or 20. When I asked his name, and he told me it was Richard, I asked him if he preferred to be call Richard or Dick. In a sombre voice he told me that he insisted on being called Richard, for as he was of such small stature, most of his friends, both male and female referred to him as Little Richard. "Besides" he went on, "my surname happens to be Littlehampton".