Popularized on the TV show Workaholics, "Wanna shmoke a bewl" is a covert way to find out if the person you're speaking to is cool, and therefore would like to smoke a bowl or could assist you in finding some weed for your bowl.
When you're a heavy smoking addict and the only place you can smoke is outside in freezing temperature, cause you hate the smoke inside your house. You shake and smoke.