It's normally used as three expressions (all depend of the situation). The word "urgh" always comes before any other word in a sentence:
1.
Madness (sometimes used to cover "
curses");
2.Boredom (just like "meh")
3.And
dissapointment;
Example:
1.
Urgh! The PC just shut down!! Now I've to start everything over again!!!
1. Second example: Urgh, stop
bothering me.
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2. Urgh (
meh)....It's summer and I don't have nothing to do..
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3. Urgh, man..why the hell did you do that!?