Asked by online sports channel Oh My Goal about his best changing room memory, the world's most expensive player chose the aftermath of that win, AFP reported.
"We all went crazy afterward. I think it was the best possible feeling for all of us," the Brazilian star said in the interview, which was posted on Saturday.
Neymar was speaking in Sao Paulo ahead of his belated return to the club today, after insisting last week that he had prior agreement from PSG to stay in Brazil to help his foundation, the Neymar Institute.
His comments are set to further strain his relationship with the club.
He wants out of the Parc des Princes and would prefer a return to Barca, but is struggling to find suitors due to the €222 million ($252 million) the capital splashed out to take him away from Barcelona two years ago.
The chances of him rejoining the Catalan giant are further complicated by Antoine Griezmann's arrival from Atletico Madrid for €120 million.
When Neymar missed last Monday's first training session PSG issued a statement declaring they would take "appropriate action" against the star.
Sporting director Leonardo has nevertheless said that "Neymar can leave PSG if there is an offer that suits everybody".
Later Saturday, Neymar added fuel to the fire over a possible return to the Camp Nou, with an Instagram post.
It was a 10-second video of himself in a Barcelona shirt, his father, and a quote from the Bible, "No weapon turned against you will prosper." (Isaiah Chapter 54, Verse 17).
Barcelona's famous rout of Paris Saint-Germain took place in the last-16 stage of the 2017 Champions League.
PSG had won the first leg of that Champions League tie 4-0 and was seconds away from the quarterfinals.
Neymar scored in the 88th and 91st minutes of the famous match before setting up Sergi Roberto for a winner five minutes into stoppage time.
That sealed their 6-1 win over PSG, which then shelled out the world-record fee to bag the Brazilian the following summer.
"What we felt when we scored the sixth goal I've never felt anything like that, it was incredible," Neymar told Oh My Goal on Saturday.