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1.
Selling popcorn

The act of standing by and doing nothing to effect or change events but attracting attention to the event itself none the less.
I was getting the crap kicked out of me and my buddy Mike was just standing around selling popcorn.
by Nathan McIntosh April 25, 2004
 
2.
Among salespeople, "selling popcorn" means to sell consumables with a low margin- otherwise known as worthless crap that you can't make a profit off of.
Joe always wins the most monthly sales but he's selling popcorn: matches, paper towels, potholders, work gloves...

I'd hate to take home his commissions.
by Cube Rat October 29, 2007