expression
in a bad mood; cranky; cross
Polite expression describing someone's foul mood, often used with だ or です. Literally 'honorable mood is slanted'.
今日は部長がご機嫌斜めだ。
The department head is in a bad mood today.
ご機嫌斜めの猫に近づかないほう
You'd better not approach a cranky cat.