fiction other, meaning a fictional character you self-ship/yume yourself with! it can be platonic (including found family) or romantic!
its like S/O which means significant other, but instead of significant its just,, fictional.. coz they aint real.
anyway your f/o loves you
person 1: someone just drew art of my f/o!
person 2: awhh thats so adorable!
person 3: eww why do you yume
person 1 & 2: *murders person 3 demurely*
the "cuter" version 'wow'... mostly used on twitter imo
"i just bought the newest nekopara artbook!"
"waow... oomf is lucky"