Scenario 1:
When talking to a person bragging about their achievements in life...
"
Erh, look at you." (Meaning not one singular life form on this earth cares about your success, nor existence for that matter)
Scenario 2:
Someone acting like a low class citizen by swearing or picking a fight with someone, when the issue can clearly be
resolved in a more civilized manner...
"Erh, take a look at yourself." (Meaning they're making such a fool out of themself, that it would be detrimental to associate yourself with the person any longer.)
Scenario 3:
Witnessing someone acting
overconfident to impress a certain group of people...
"Erh." (Meaning they just deserve a good, old-fashioned
erh.)