'Fake S' is when you do an 'S' at the end of a beatmap but you didn't FullCombo'd it. Meaning if you miss a slider or press a slider too early and you don't miss any other notes you'll get an S.
So the request is a 'Fake S' icon that you get that kind of 'S' when you don't FullCombo.
The reason why do we need a 'Fake S' is because it's annoying to see an 'S' at a beatmap and you know you didn't even FullCombo the beatmap thus you need to play that beatmap again for a FullCombo.
~Luff Jennie <3
So the request is a 'Fake S' icon that you get that kind of 'S' when you don't FullCombo.
The reason why do we need a 'Fake S' is because it's annoying to see an 'S' at a beatmap and you know you didn't even FullCombo the beatmap thus you need to play that beatmap again for a FullCombo.
~Luff Jennie <3