From Dragon Ball Encyclopedia
Slimjim is a member of the Red Shark Gang.
Dragon Ball Z
Slimjim appeared during the Great Saiyaman Saga. He and Jimbo held the mayor of Satan City at knife point and demanded that Mister Satan come out to fight their leader. Slimjim and Jimbo were the first two members of the gang to be seen when they went on a joyride and terrorized the citizens. Son Gohan stepped up to fight them. When he saw Son Videl watching, however, he let his guard down because he did not want her to know of his strength. Jimbo landed a punch to Gohan's face and Videl jumped in and took out Jimbo with ease, and the two fled back to their gang.