A Pwam is the guy that is just there for the food. He is excited for the food. He loves the food. He cherishes the food. Good food? Bad food? It doesn't matter, he's just excited for the food.
pwamp is the most versatile word/onomatopoeia yet. It can mean anything, everything, or nothing. Used as an adjective, noun, verb, adverb, and especially an exclamation. Definition usually determined based on context clues.