Member of middle-management who, when asking you to do something perfectly reasonable, can't help spoiling it by adding an unnecessary stress-causing qualifyer. E.g., ...instead of just standing there. Example: John, can you restock the cigarettes please? Sure. I think it's only fair, after all I did let you go home early last night. Geez, what a spoiler.
SPOILER
Meaning of SPOILER in English
Slang English vocab. Английский сленговый словарь. 2012