Meanings of biting little in English

I don't think we should mind her biting little speeches and sharp looks.

Rilla remembered how clever and amusing she used to think Irene's biting little comments about other girls.

However, he was not blind to the absurdity and self-centeredness of personal prayer, as this gentle but biting little satire, written in 1940, will show.

Now and then she punctured some harmless bubble of a young man's conceit or masculine superiority with a biting little line of daintily written script.