That means “citrus coalition.” The Greens have green as their party color (what a surprise) and the FDP has yellow.

Germany’s Kingmakers – Difficult Talks Ahead for Greens and Free Democrats – The Green Party and the business-friendly Free Democrats plan to hold exploratory talks with each other before meeting with the main chancellor candidates in the coming days. They appear to be worlds apart but are already finding some common ground…

FDP leader Christian Lindner also continued Monday with the message he initiated on election night: measured praise for the potential coalition partner. The Union (CDU/CSU) and the Social Democrats (SPD) are not parties of change, he said. In talks between his party and the Greens, it would therefore be necessary to examine “whether, despite all the differences, this could become the progressive center of a new coalition government,” even if that seems like a bit of a stretch.