When a bro is walking and the breeze is going the opposite direction of his flow, thus messing it up.
This creates an unsettling feeling and he must push it back the other way. It's even worse if the broski's hands are full and he cannot fight the counter-flow.
{It is essentially the wind, but only in the wrong direction}
Fuck dude, how's the flow? I experienced counter-flow on the way to class.
I looked like a fuckin' mess when I walked by Julie because of counter-flow.