Squillo·To call someone on the phone long enough for it to ring so they know it's you, then hanging up. Source
Benaltrismo·The strategy of dodging or ignoring a problem by pointing that there are others, more compelling problems to solve. Source
Ammazzacaffè·Hard liquor usually consumed after the postprandial coffee in order to wipe the bitter taste out of the mouth. Source
Mortacci tua·Insulting you via your dead loved ones (literal translation: Your ugly dead relatives). Source
Rompere il cazzo·Literally to break the cock (vulg.) : to be utterly annoying, to be exasperating. Source