Dru Down and The Luniz recorded a track called 'Ice Cream Man' for Dru Down's Explicit Game (back in 93-94). P heard it on a local radio and stole the name 'Ice Cream Man' and recorded a song which was a great success. The Luniz and Dru Down haven't been credited for it. Numskull (of the Luniz) dissed P on the song 'So Much Drama' (on their first album). Then, Yuk dissed P on almost all his albums. There are several other reasons like the fact that P tried to buy 2Pac's unreleased material from Afeni (Yuk teamed with Outlawz to record a remix to 'Still Ballin' on which they disssed No Limit). PM me if you want some tracks.
For those who don't know why Yuk diss Afroman. It's because he said that Yuk was whack in an interview with worldwideconnected.