Sentence:  Adrian thought it worth while to try out his new slang. ‘I say, you <WSD>fellows</WSD>, here's a rum go. Old Biffo was jolly odd this morning. He gave me a lot of pi-jaw about slacking and then invited me to tea. No rotting! He did really.' 
Meaning of the word marked with <WSD> tags:  (nodot=a): a student at the same school.