Blarg is a nonsense word used to replace virtually any other word in the English language. Known to replace simple greetings like hello, melancholic resignations like oh well, as well as endearments like sweetie and profanity like mother-fucker, the exact definition is based on the situational context and the speaker's tone.
Being more flexible than other such nonsense words, blarg can also be used to replace entire sentences and even simple conversations, though those situations often depend on facial expressions and even the use of props or hand movements to further define the word usage.
Profanity: "What the blarg is that blarg doing? Get the blarg off the road!"
Endearment: "Blarg! You shouldn't have!"
Resignation: "Blarg, man..."
"Blarg tae aw da yids and swankers! (Hobo dave)"
Bored: Blarg. (said in soft, monotone)
Elated: Blarg! (In happy voice)
1) An utterance of complete bafflement (as noted many times the author of such bafflement may remain speechless with only the word "blarg" comprehensive for some amount of time)
see also: confuzlement
2) A vocalization of complete disgust. A short pantomime of a vomiting sound. In this case you might want to draw the "blarg" out more to sound like a more authentic vomiting sound.
3) A short sigh expressing sadness and frustration in the same instant.
2. Sometimes also used as an explitve.
3. Has also been used as a universal word in place of any other word.
4. In some circles, Blarg has taken the upon the meaning of Nay, or No.
"This is all Blarg" "All I have to say is, Blarg!"