The word �pee' - and its alternative 'the p-word' - is just a representation of the letter �P', that being the first letter in the four-letter word ending with �iss' but now considered crude. It was introduced towards the end of the supposedly prudish Victorian age to protect people's genteel sensibilities. Similar coy versions exist in French and German, too.
Just a word of advice...if you have lots of questions, it is best to put them all into a single thread. Doing it as you've done here just shoves everybody else's questions down the page and off onto Page 2 where they may be missed.