What the hell is playing the mariachi music?
That Mexican Squirrel over there.
When you cover your sexual partner in butter and then blow into their anus like a French horn while they emit a high-pitch mating call similar to a squirrel to signal arousal in the nearby animals.
I was at a furry convention and gave this chick the ol' butterhorn squirrel and next I knew they were swarming my windows and doors looking for a piece of the action.