That means kingmaker.

You know, as in Germany’s FDP party (classic liberal, business-friendly)? They will most likely decide what kind of coaltion Germany will now get. Either SPD-Green-FDP or CDU-Green-FDP. Unless, of course, negotiations fail and they go back to another grand goalition of CDU-SPD, which absolutely nobody wants.
Germany’s FDP holds strong cards in post-election haggling – Buoyant from its best election result in 10 years, Germany’s liberal FDP party looks set to play a outsized role in coalition negotiations to form the next government…
The FDP wants to avoid tax increases and preserve Germany’s cherished debt brake, while the SPD and the Greens want to raise the minimum wage, increase taxes for the wealthy and and invest public money in tackling climate change.
“The coalition issue is extremely difficult for the FDP. Its members do not want the FDP to be propping up a left-wing government,” said political scientist Oskar Niedermeyer of the Free University of Berlin.