The meatball marinara is when a girl is on her rag (so naturally you dick isn't penetrating the vagin) so you bang her in the ass doggie style. Ass your balls slap of the chicks vagina they splash blood all over your sack. When you are done you have what looks like a Meatball Marinara

A buzz word being used to refer to creators and influencers forming or encouraging unhealthy relationships with their fans. Usually used in the context of young audiences feeling they have a relationship with the influencer due to the huge amount of the influencer’s content they consume. The influencer in question, however, is unaware of the fan’s existence other than the general knowledge of having fans. Common examples include Dream and his stans. These relationships are exacerbated by the influencers confirming they have more than a creator-to-viewer relationship.

The word is circulating due to various YouTube essays about the phenomenon using the word, and therefore people who enjoy complaining about influencers repeating what they heard in the video in any comments section they can find.

when you have sexual intercourse with a girl who is on her period and then when you "finish" she licks the blood off your balls, hence the term meatball marinara

Bloody and/or chunky jizz.

A Meatball Marinara is when you eat a girls ass that is full of shit while she is on her period. The mix of poop and blood will resemble a meatball marinara sandwich.