Usually involves Clear Channel Communications or Entercom. An automation system. Recordings of dudes with huge egos flirting with teenage girls. Reverb. Pitched up music. And the same cRAP played over and over and over and over and over and over and over again until you want to throw your radio out the window.
Can also mean other things. Depends on the city.
102.7 KIIS FM I'm Ryan Seacrest and I love myself.
103.7 KISS FM hey here's some more rap yo girlie girl
103.5 KISS FM whats up I'm a dude hey here's a hot joint girlie girl I want yo numba!
96-1 KISS FM here's Jack Johnson with Flake!
Kiss 108 is WXKS Medford-Boston
104-7 KISS FM whazzup Phoenix yo we playin some HOT JOINTZ FO SHO!