>>537It's an inside joke from greentext stories. Basically, over the top and cringe inducing awkward situations. Many of them ending with something as a bait-and-switch like spaghetti spilling out of their pockets to make it all the worse and the humor is from it coming out of fucking nowhere.
It escalated into more and more over-the-top spaghetti related endings until it became informally synonymous for social awkwardness.
You probably won't find it funny anyway, but that's the explanation for why it's around.
Pics related, the one that started it all and the other is how the joke escalated.