Literal translation
to have an air of two airs
Meaning
to have an ambiguous, unreadable expression
Explanation
To wear an ambiguous, unreadable expression, a face caught hesitating between two looks that no one can quite interpret. The image joins other ways of naming indecision, such as mi-figue mi-raisin in French or ni car ni pèis in Provençal. This kind of uncertain look tends to irritate and usually draws a reply along the lines of come on, say plainly what you think. The word èr, look or appearance, is used broadly in Provençal, for instance in douna d'èr, to resemble.