[diablerouge]

My guess is that OP did indeed mean "knocking boots" as a reference to Operation Paperclip, where the US government granted amnesty to a bunch of Nazi scientists in return for pivoting their research to US national security purposes.

edit: source https://en.wikipedia.org/wiki/Operation_Paperclip

[jasonfarnon]

when I was growing up "knocking boots" meant have sex? (there was a whole rap song with that title). Which is what I assumed "squamming loins" was some british english version of.

[noah_buddy]

It’s a metaphor in the same sense as “strange bedfellows.”