A person who has a sudden love for the band 5 Seconds Of Summer after hearing their "first" song She Looks So Perfect.
Pronounced 5-es-oh-es.
Pronounced 5-es-oh-es.
Girl1: OMFG I JUST LISTENED TO 5 ES OH ES NEW SONG SHE LOOKS SO PERFECT! IM THEIR #1 FAN 5SOSER FOR LIFE!
Me: Shut up.
Me: Shut up.
by PenguinHemmo May 7, 2014
It is those group of people or a person itself as a new fan of the 5 Seconds of Summer. They pronounce 5SOS as ‘5 es-oh-es’ Usually consider itself a fan after the 5 Seconds of Summer released their single She Looks So Perfect.
by IamGucci April 14, 2014