He spent a couple of years in Singapore, so I'm going by the pronunciation there. (May be different in different regions, and I'm not sure about his preferred pronunciation now). It would do something like this:

Start with the word "urn". Now don't drag it out, make it short. Make the "n" and "ng" sound at the end (urng). Now take out the "r" sound (uhng).

It seems like Americans do tend to pronounce it "ehng" instead.