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Illinois Men's Basketball Team Celebrates Sweet 16 Win W/ Water Gun Fight ... Coach Goes Shirtless!!!

Forget poppin' bubbly, the Illinois men's basketball team got in a water gun fight to celebrate its big Sweet 16 win on Thursday ... and the celly got so wild, head coach Brad Underwood actually ditched his top for it!

The H2O battle happened just minutes after the Fighting Illini pulled off a 72-69 upset win over No. 2-seeded Iowa State in the NCAA tournament.

THE BREAKAWAY JAM 😤#MarchMadness @IlliniMBB pic.twitter.com/EPz6GD2mnM

— NCAA March Madness (@MarchMadnessMBB) March 29, 2024

Underwood -- sans tee -- kicked off the war by busting through a curtain with his staff and blasting a giant super soaker on his players.

Quincy Guerrier, Max Williams, AJ Redd and the rest of the dudes came prepared, though, and returned fire with their own smaller water pistols.

The whole celebration was a vibe ... and the team certainly deserved it -- as this is the first Elite Eight they've reached since 2005.

"This team's got swag," Underwood said after the win. "They don't fear the moment, they don't fear anything, they compete."

The Fighting Illini will try to bring their wet and wild celly to the Final Four on Saturday ... when they take on UConn.

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