Refers to having a pointless debate with somebody utterly ignorant of the subject matter, but standing on a dogmatic position that cannot be moved with any amount of education or logic, but who always proclaims victory.
"Debating creationists on the topic of evolution is rather like trying to play chess with a pigeon; it knocks the pieces over, craps on the board, and flies back to its flock to claim victory." -- Scott D. Weitzenhoffer (From an Amazon.com book review)
Man, trying to explain to those moon landing deniers that the Apollo program was real is like playing pigeon chess -- all they do is knock the pieces over and crap on the board.
To post incessant, inane threads on an internet forum to alleviate boredom or sexual frustration.
Must be slow at work -- Scott's done nothing but posturbate all day on HC.