On: Bullshit-sensitivity predicts prosocial behavior

[svachalek]

I think behind our back is a metaphor for "well hidden, even from ourselves"

[sporkologist → svachalek]

The only context I've heard is "talking about someone / doing something behind their back." Yeah I suppose you can construct more meanings for it, as OP authors apparently wanted to do. And down the BS rabbit hole we go.