Although usually meaning a small piece of excrement attached to the hairs of your arse, sometimes known as a Clingon, it can also mean someone who is a minor, smelly, unpleasant nuisance that is sometimes difficult to get rid of.
When someone who "thinks" they know something about computers/servers and attempts to "repair" one, usually leaving it in worse shape than it was in the first place. This can happen because the "guru" emits an EMP pulse that disables all electronics within a 25ft. radius.
A small release of gas from the anus, but of a smaller quantity than that of a regular fart. One can release a series of fartlets and achieve the same rank effect as a whole fart.