Top Definition
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.
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.
by PenguinHemmo May 06, 2014
1 more definition
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.
5soser: “OMG THE LEAD SINGER IS SO HOT!!11! I AM A 5SOSER NOW1!11!”
by IamGucci April 14, 2014

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