"My favorite store on the citadel" is a phrase originating from the line of dialogue "I’m Commander Shepard, and this is my favorite store on the Citadel" from Mass Effect 2. Since Shepard could\ say this for every single store, it becomes comical and virtually meaningless.
In normal conversation, the phrase can mean something is:
1. Average
2. Mediocre
3. Unremarkable
4. Pointless
In addition, it can be used as a completely neutral response when asked your opinion on something and you have none or don't care either way.
That new Adam Sandler movie was my favorite store on the citadel.
The new restaurant was whatever, it was my favorite store on the citadel.
Wife: "How do you like this dress?"
Bored Husband: "I don't know, it's my favorite store on the citadel. Can we go now? We've been shopping for hours!"
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
A phenomenon in film/television series, most notably streaming series, where the main premise is drawn out to such a point that it takes an entire season or more to get the parts of the series the audience is actually interested in seeing.
For example, if a series is titled "Surf Dracula," a majority of viewers would tune in expecting to see Dracula surfing by the first or second episode. However, the entire first season would instead be tedious padding and backstory before finally ending with Dracula surfing in the last five minutes of the season finale.
I watched "Smallville" on Netflix the other day. Dude, it was ten seasons of filler before he finally flew! Major Surf Dracula Syndrome!