As a locution does not exist. It almost seems like an attempt to get Google or the like to associate it and make sense of it; But a dictionary search engine doesn't work like that. Nor should it. Although as right now I have nothing better to do, I will associate them. It turns out that chichi is -among other things- a euphemism for "vulva, vagina", a little less shocking than "pussy" or "shell"; and pesi cola is a vulgarization of the brand of soft drink Pepsi Cola (or simply Pepsi) that for some reason in Spain was chosen to graph a "state of emotion or vehement desire" with the (this time yes) locution "the ass is made pepsicola" that I will not analyze, but I do note a parallel with another phrase like "make the pussy pepsicola". However, it seems difficult to modify a non-sexist expression (let's say better, unisex) to make it purely and exclusively feminine: a reverse situation would be more credible. In any case, we would have to look for an origin, a trigger, and I remembered the song from the early 2010s called Pussy ('Pussy', pacatamente translated as 'Cola') dedicated to the former producer and now convict Harvey Weinstein by the indie singer Lana del Rey, which begins with the surreal verse "My pussy tastes like Pepsi Cola" ( "my vulva tastes like Pepsi Cola" ) , and that it must be the origin of the phrase in question.
