by My pseudonym is 'Poop' May 22, 2015
sideman (adj) a fat fuck who just plays online poker all day he also does not have any friends and no one likes him cuz she smells he also isnt well with the ladies
Rob SIDEMAN is the biggest fucking retard out there if he walked up a flight of stairs he would break his ankle
by chris seymour March 12, 2005
A person which intentionally leaves out a friend a special occasion e.g a birthday party or an event/outing
Tim is such a sideman he didn't invite me to Thorpe park. Look at those sidemen. What a side he just left me waiting.
by Pseudonym536 May 31, 2014
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.
by "Mike has sideman syndrome" March 31, 2015
by tattycat678 July 22, 2019