Definition
To act 'pettily' means behaving in a mean and small-minded way, especially over trivial matters. It involves getting upset or making a fuss about unimportant things. It often suggests a lack of maturity or a desire to hold grudges. Pettiness usually stems from insecurity or jealousy. For instance, arguing over who gets the last slice of pizza is acting pettily. Imagine someone pettily trying to sabotage a friend's project out of envy. Essentially, it's about making a big deal out of nothing.