Meanings

1. 1

   above all (of prime importance), especially, particularly

2. 2

   colloquialused to highlight a point that is considered particularly baffling or galling by the speaker; and the thing is, the kicker is

   Ich weiß gar nicht, warum er sich so darüber aufregt. Vor allem macht er sowas ja selbst oft genug.I have no idea why he's so upset about it. And the thing is, he does the same thing himself often enough.