Steady chirping sound emanating from crotch of pants by office worker sitting at desk after lunch trying unsuccessfully to sneak out a "silent but deadly" fart without surrounding cubicle mates taking notice as passed gas metabolizes itsef into a string of discrete and constant mini-farts.
The noise from a chain reactor fart.
Herbie thinks he's so cool, sitting there staring at his monitor, pretending to be working, all the while the ass crickets singing in his pants.