The Meaning of Guru

Today I met one of the managers of the development team I work with in India. I was chuffed to learn some people call me “The Guru” over there. The manager went on to mention the etymology the word:  ‘Guru’ is composed of the syllables ‘gu’ and ‘ru’, the former signifying ‘darkness’, and the latter signifying ‘the destroyer of that [darkness]’, or the ‘bringer of light’. My own manager quipped that the light in question was actually the reflections off my head (probably a fair call, but I actually think the light shines forth from another orifice).