Eating the roach of a blunt. It is a tradition is some parts of Parma, Ohio.
AG: What the fuck are you doing?

Joe: Popping the walnut, it's a tradition man.

AG: Are you sure that's a good idea. . .
by Kottonmouth Kringle December 2, 2009
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When a man loses his anal virginity. Similar to "popping a cherry" for women, but with nuts...
I went to the club expecting to find a woman, but instead I popped a walnut
by texagg57 December 1, 2015
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