Adele Explains Her Famous Courtside Meme, Blames NBA Film Crew

Adele finally explained why she was making such a goofy ass face at the NBA All-Star game a couple years back -- and, apparently, it all has to do with film crews defying her wishes.

The singer got into the story over the weekend at her Vegas residency and explained what's become one of the most famous Adele memes. You've seen it by now ... the camera cuts to her sitting courtside, but she's awkwardly looking around avoiding making eye contact.

Adele says an NBA film crew on hand had asked ahead of time if it'd be okay to record her during the broadcast, which she says she politely declined because she "really doesn't like being famous" and was content with her boyfriend Rich Paul doing the schmoozing.

Well, they ended up circling back and filming her anyway ... and that ticked Adele off.

Adele says that rather than engage with the camera like she was supposed to -- or how others might in the situation -- she decided to play dumb and just scan the arena, all aloof.

In terms of her very full lips -- another observation people have made about the now-viral clip -- Adele insists it's all-natural, noting she doesn't need filler. Anyway, the bigger point here is that she says she was sulking in the moment ... and expressing defiance against the NBA.

It's pretty funny that Adele thought she could go unseen/unnoticed at a star-studded event -- especially when she was seated next to the most prominent NBA agent in the league ... the dude who literally reps LeBron James and a crap ton of other high-level players.

Since then, Adele has continued to be pretty camera-shy out in public with Rich -- but when she's in her own environment in Vegas ... she's an open book, and very chatty.