^ Ok, here is the answer. It's really a nit to pick:

This chord is and F-sharp dominant 7th chord (which is a major triad plus minor 7th above root) with an added flat 9.

So the pitches of that chord are:

F# A# C# E G

The next part (/Db) means all of that "over D-flat", so a D-flat is in the bass.

The thing is, this is a chord built on a sharp key and root, so even though it sounds the same, you should need consistent and spell that pitch as C# in this situation.

Take the main part of this, which is an F# Major triad. That's spelled F# A# C#. You would never spell that 5th as D-flat, even though it's enharmonically the same pitch.

Thank you for attending my very tedious TED talk.

@voltronic

I’ll try: the 7th of F is E and E sharp is actually just F.

@mikeflstfi
This is a dominant 7th chord with modifications built on F#; not F. As it happens, the (minor) 7th degree in that chord is E, but that's not the error I'm referring to. It is an enharmonic spelling thing though, so you're on the right track.

@voltronic

That's about as far as I am able to get with my limited theory knowledge! :)

@voltronic

Fine! Just take your highly specialized knowledge and shove it in our F#A#C#E#

@Tinjaw
That's a lovely major 7th chord, and something that sounds much nicer than the chord in the meme.