Bleah - This sounds like "blech" or "bleh." Bleah isn't common. It's to mimick the sound one makes to represent "ew." Ex. "Bleah! It smells disgusting in here!" Argh - This is the sound one makes when (s)he is annoyed or angry. Pronounced "arg." Ex. "Argh!! Why isn't this working?!" Cough up - This is an expression. It means that someone is coughing so hard, they cough out phlegm, food, or something of that sort. People often say they're coughing up something that can't be coughed up, e.g. "coughing up a storm." Ex. "He was so sick, he was coughing up everything!"

May I suggest www.thefreedictionary.com. It is an excellent online dictionary with examples.