ronnynat: It smells like a compost pile mixed with a sour organic after smell. If you drink it, people will smell it from fifteen feet away and cringe if you talk to them. Assuming they don't eat/drink it themselves.
If you want to try it head to Eden place or you can pick them up at the Florida market in D.C.
From what I've heard the green variety is the most intense. I've eaten intense flavors like Sri Lankan sambols, Korean chopped octopus (live) sprinkled with chili/vineager and fried silkworms with mystery sauce but green Durian turned my stomach. It has an almost alkaline taste and a sour smell. I had it as a "milkshake". That said, drinking it causes a heck of a buzz.
I've heard the red is the easiest for the uninitiated, than yellow. Maybe someday I'll work up the courage to try again.