1 definition by Jim Bobbbb

When a straight heterosexual male accidentally sticks his thumb up another man's rectum, purely by mistake. Usually occurs in male community showers at gyms or prisons/correctional facilities and dark rooms.
As I entered the dark room, I slipped and fell on Greg's bed, accidentally giving him a wilbert.

As the doctor was checking my cheeks, he accidentally gave me a wilbert.
by Jim Bobbbb May 05, 2008

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