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A fake way to say you're smoking weed so you don't get caught, like a kid lying to his mom about eating a sandwich instead of sneaking a hit from a joint.
'I'm eating a sandwich, Mom!' he yelled, holding the joint behind his back.
'I had to eat a sandwich in the bathroom because I didn't want my dad to know I was high.'
He said he was eating a sandwich, but the smell of weed was coming out of the sandwich bag.