PES stands for Phonetics and English speaking, an insanely useless class that is a must take for any student wishing to rot his/her way to glory because of the induced boredom, in a well known institute in western india.
Pronunciation: like 'Piss' ( At least it _should_ be like that)
feeling after attending
the class: Like Piss;
disgusting, but a feeling of relief after its over.