grateful for the past, now onto the next and deadass not looking back. kinda like fuck off, but in a more sophisticated way

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Another way to say fuck off to somebody who claims to hate relevancy

thank u, next is the 11th track off of her 5th studio album. It's about her ex's and how she grateful for all of them.
Big Sean: "Thought I'd end up with Sean but he wasn't a match"
Ricky Alvarez: "Wrote some songs about Ricky now i listen and laugh"
Pete Davidson: "Even almost got married and for Pete, I'm so thankful"
Mac Miller: Wish I could say, "Thank you" to Malcolm 'cause he was an angel

"Thank u, next" Is a popular song performed by Ariana Grande, the song is about her real life, but the music video makes it look like a fictional character's life, but in a weirdly lovely way.

The meaning of the song is that she got enough pain by loving boys, some people said that she turned into loving girls, so the point of the song is "Thank u boys, girls next"; Anyways it's not a fact, because she has tried already lesbian experiences.

The music video breaks the record as the most watched video on youtube in the first 24 hours, and the special things about the music video is that it revived some of best popular old movies and included popular youtubers and actors.

when u break up with ur boyfriend and move on being stronger than u've ever been

A great way of telling someone on a dating app, that you're not interested. Usually said right after receiving a face picture. It important to note that it means next person, not picture.