Sukuna is the main antagonist of Jujutsu Kaisen, the manga series by Gege Akutami that began in 2018 and was adapted into an anime in 2020. Voiced in Japanese by Junichi Suwabe, the character is known for his arrogant, amused way of speaking to weaker opponents. Short clips of his lines circulate widely on soundboards and in anime edits, and this repeated gambare line became popular as a reaction sound because it captures his mocking personality in just over a second, making it easy to reuse across memes.
About this sound
Sukuna gambare gambare sound effect from Jujutsu Kaisen, a short taunting voice line repeating do your best that fans use for mock encouragement memes.
This short voice clip features Sukuna repeating the Japanese phrase gambare gambare in a calm, condescending tone. Gambare means do your best or hang in there, but delivered by Sukuna it sounds less like support and more like a taunt aimed at someone who is already struggling. The repetition and his relaxed delivery make the line feel smug and dismissive. Listeners instantly read it as fake encouragement, which is why it lands so well over moments of failure, embarrassment or hopeless effort where someone is clearly not going to succeed despite trying.