It's a classic 

An excuse for an embarrassing song in found in one's music library

Person A: "Really man? You have 'Stacy's Mom' on here?"
Person B: "Dude, it's a classic"

It's a classic by Lax13 August 1, 2010

It's a classic! 

Another dumb statement that people online make, usually about a new album, in most cases that they haven't even heard yet.

1.
Random person reviewing an upcoming album: aye yo I know it ain't out yet but I already know it's a classic, Youngboy never disappoints!

2.
Luke: Aye u heard that new Kendrick Lamar yet?
Lauren: No not yet but it's a classic!
Bill: Kendrick's new album sucks and you guys are idiots, listen to some real rap for a change.

3.
Random dumbfuck: Oh my god Lil Uzi Vert just announced his new album I can't wait I already know it's a classic just based on the first single alone I know it's a classic!
Normal person: How do you know it will be a classic if it isn't even out yet?
Dumbfuck: Because Uzi never disappoints, and everything he drops is fire so I know this ain't gon be no different, and I do want to go to hell with him!
Normal person: Everything he drops is shit, but yeah have fun in hell.

It's a classic! by Icy Wyte July 25, 2022

but it's a classic 

How an egyptian pool singer will explain why he doesn't need to change song

So the guy said "but it's a classic!" so we kept the noses on until we left the store.

but it's a classic by Makrellen August 12, 2017