Geri Miller, the pop scene's perpendicular pet, was so stunned the other night at Max's when she spotted her new heartthrob (a member of one of the top five groups in the country) necking in the back of Max's upstairs discotheque with pop-columnist Cleo, that she wrenched the blonde writer from his arms and punched the surprised singer square in the jaw. Cleo, a petite 5'5", lifted herself up from the floor during the brief skirmish that ensued and whacked Geri from behind with the closest available thing she could find, a half full salad bowl, spilling lettuce and other assorted greens all over Geri, her embarrassed suitor, and the booth next to them. In the next booth were Viva!, Rene Ricard (that's another story), and Al Aronowitz. The battle royale almost ignited with Viva! and Rene, who "don't take that stuff from nobody," was averted when public relations man Dominic Sicilia, an ex-Vic Tanny member, stepped into the middle and put everyone in their seats with some deft Japanese wrestling techniques. We've since heard that the enraged Miss Miller (who, incidentally, is featured sans clothes on page 105 of tne November Playboy), promised she "would get Cleo," and is laying out for her nightly in the back room of the scene.