Should we call him Fatman? Club king Slim, a.k.a. Norman Cook, seems to have grown up a little on Palookaville, judging by melancholy numbers like ''Put It Back Together.'' But his party jams ''Slash Dot Dash'' and its high-BPM (beats-per-minute) ilk feel half-cocked, like Cook can't quite commit to the moment. As for tracking on the Bootsy Collins-assisted cover of ''The Joker, ''let's not and say we did.