A fan of any team or group that is so irrational they are impossible to reason with. They often hate their rival team or group and can be very cruel.
by Gothedistance49 August 20, 2016
Get the 10%ermug. by moogar October 1, 2006
Get the 10%ersmug. by PM_TheButtPirate September 22, 2012
Get the 10%'ermug.