A marijuana term. A zombie bowl is two (or more) pieces of previously smoked marijuana that are put together in a pipe/bong to be smoked for the last time.
"Dude we're out of weed"

"It's cool, I have some ash, we can pack a zombie bowl."
by XChristian924X January 29, 2015
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A public toilet that someone has left completely shrouded in toilet paper
I went into the men’s room this afternoon and the back stall contained a zombie bowl. There was so much paper draped around the thing, I was afraid whatever lay beneath might re-animate if disturbed.
by Furry Trout June 12, 2012
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