No. Haragei is a way of silent communication. It's not related to martial arts. It's more, really, a sort of "good old boys'" nod and wink kind of thing: when people are from the same background and have very closely related interests (particularly political interests), they don't need to say much. Or else they can say one thing, but the people who count will understand that they really think the opposite.
Interesting. There seems to be some of that on this forum.