noun
provokingly calm; annoyingly composed
Used to describe someone who remains irritatingly calm in a situation where agitation would be expected, often with a negative or sarcastic tone.
あいつ、怒られる場面でも糞落ち着きでムカつく。
That guy is so annoyingly calm even when he's being scolded, it pisses me off.
彼女の糞落ち着き
Her provokingly calm demeanor goes beyond admiration and just makes me angry.