That means export or trade surplus. In this case the German trade surplus, of course.
Also see: Böse Buben. That means bad boys.
Christine Lagarde (IMF) and Donald Trump may not have much in common at first glance but one thing they seem to agree upon is Germany’s trade surplus. That is, Germany exports more to, say, the USA than it imports from that country (same procedure with practically every other country Germany deals with, too). And it’s been like forever already.
So Germany, just in case you didn’t know it, you’re being a very bad boy.
Deutschland wird zum bösen Buben des Welthandels.