It's as some others have said but just to clarify.
It's when you lose a bunch it gives you a boost the more you lose but does not actually give you more wolf marks and exp until you win. So if you lose say 5 games in a row you will get the same amount of stuff every 5 games but then you win the match after and it will be boosted.
After that it resets so if you won again right after it would be the standard amount of a win.

I don't have the exact quote for you but it was confirmed by a community rep sometime shortly after front lines came out.
I don't know more then that