From Uncle Fred Flits By by P.G. Wodehouse:
The meaning of bulging by dictionary is: protruding part, a sudden increase in number or quantity, and last is: an advantage. I don't see any of these fit in the phrase "bulging with Pongo's lunch" - How can these be applied to "lunch" - a food ?
So when, on the occasion to which I allude, he stood pink and genial on Pongo's hearth-rug, bulging with Pongo's lunch and wreathed in the smoke of one of Pongo's cigars, and said: 'And now, my boy, for a pleasant and instructive afternoon,' you will readily understand why the unfortunate young clam gazed at him as he would have gazed at two-penn'orth of dynamite, had he discovered it lighting up in his presence.
Please explain me the meaning of the sentence also, I am not able to clearly get its meaning although I have referred the oxford dictionary for all the words I don't know.