A fired college baseball coach allegedly hijacked Twitter accounts and started a social media war with the school after he got the axe ... and now, the university is suing the guy over it.
Here's the deal ... Saint Xavier University in Chicago, Ill. says in a new lawsuit, obtained by TMZ Sports, it hired Rocco Mossuto to coach its baseball team back in 2014.
The problem ... the university says after officials canned the guy in 2020 -- he hoarded all of the team's Twitter account passwords and refused to give them back to the school for WEEKS.