Top Definition
The fans for the Australian band 5 Seconds of Summer or 5SOS. A short form for the fandom name is the 5SOS fam. The band consists of Luke Hemmings (vocals, guitar) Michael Clifford (backing vocals, guitar) Calum Hood (vocals, bass guitar) and Ashton Irwin (backing vocals, drums).
Fan 1: Are you part of the 5SOS family?
Fan 2: Of course I love them and their music!
by adedicated5SOSfammember December 28, 2013

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