"Zeru tituli" is a code word in both Inter and AC Milan's history.
It refers to Massimo Ambrosini's two year old Inter taunt when AC won the 2007 CL finals.
On March 3rd, Mourinho threw the taunt back as he said the Rossoneri would win no titles more than two months before the end of the season. The infuriated Ambrosini went on air to ask for an apology. Which set off Mourinho.
The two words have become viral with legions of Inter fans sporting banners. Zero titles has become Dante's inferno for Ancelotti, Ranieri, and Spaletti. None of them might return next season. It has become a verdict without trial. Split rivals, sown dissension, and vitiated club atmosphere.
Yesterday, Milan lost to Udinese, 1-2 gifting Inter their fourth Serie title in succession. It gave the Special One his first scudetto making today's 3-0 win over Siena moot.