それじゃ - 1: well then ...;2: in that situation; in which case (そんじゃ here is colloquial).
いただく - 1: (Humble (kenjougo) language) to receive; to get; to accept; to take; to buy; 2: (Humble (kenjougo) language) (Polite language) to eat; to drink; - Meals in Japan traditionally begin with the phrase itadakimasu (いただきます - literally, "I humbly receive" - いただきやす here is colloquial).
うまい - delicious; appetizing; appetising (within this context).
だろう - 1: seems; I think; I guess; I wonder; I hope; 2: don't you agree?; I thought you'd say that! (だろ here is colloquial).
だーーーー Sound of being sick.
こら - 1: interjection meant to scold or reprove someone; hey!; 2: interjection to call out to someone; hey!
これ - This (indicating an item near the speaker, the action of the speaker, or the current topic)
食い物 - くいもの - food; prey; victim (くいもん here is colloquial).
なの - In this case なの is a version of the んです or のです grammatical construction that is used to highlight a subject or situation at hand and to seek confirmation of current circumstances.
か - indicates question (within this context)
ひどい - cruel; awful; severe; very bad; serious; terrible; heavy; violent (ひっどーい here is for emphasis).
"N...Not at all! Well then, let's eat!!"
"It's delicious, right!?"
"I..Is this even food!?"