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This is the case of being a sideman to everyone, even if you are in a new friend's group you are still a sideman. To identify someone infected with sideman syndrome you must spot the sideman in a group if friend's which are sidemen.
"Oi Mike has sideman syndrome"
"yeah i know that twat is still a sideman even with other sidemen"
by "Mike has sideman syndrome" March 31, 2015
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