To get angry; to get hot and bothered

My grandfather gets hot under the collar when it comes to feminists; he says they ruined male-female relationships

Mio nonno se la prende sempre calda con le femministe perché dice che hanno rovinato le relazioni uomo-donna

I don't know why, but all of my girl-friends get hot under the collar when they hear stupid jokes about women drivers

Non so perché, ma tutte le mie amiche se la prendono calda quando sentono sparlare delle donne al volante

The expression, which dates from at least 1895, alludes to the red (or hot) color of an infuriated person's neck and face, due to the rush of blood in those areas