Eric Garcetti

Everybody LOVES some good old fashioned smack talk ... even politicians ... just ask the Mayor of Kansas City -- who's rippin' into the Mayor of Los Angeles over the MLB playoffs. Of course, the Royals are taking on the Los Angeles Angels of Anaheim -- and K.C. Mayor Sly James is stickin' it to…

The Stanley Cup is so powerful ... it even has normally boring politicians fired up -- like L.A.'s Mayor Eric Garcetti, who decided to drop a televised F-bomb at the Kings celebration today. The L.A. Kings victory parade ended with a ceremony at Staples Center ... and Garcetti took the mic to…