Snoop Dogg ain't apologetic about his raunchy booty and money-throwing performance at the Univ. of Kansas this weekend ... saying he had one hell of a time, and the school should've known what they were getting into!

Of course, the rap legend pulled out all the stops for the Kansas Jayhawks basketball team's annual Late Night in the Phog pep rally on Friday ... complete with pole dancing women and money guns.

After the show, KU officials apologized saying Snoop's camp assured them before the show that his performance would be more family-friendly than his usual schtick.