This is Gojo's iconic "yowai mo" line from Jujutsu Kaisen, which basically means "so weak." It's that moment where he's just casually dismissing someone as pathetically underpowered, delivered with his typical arrogant confidence. People use it whenever they want to sound condescending about someone's abilities or just make fun of how overpowered he is.
Yowai Mo (Gojo) Sound Effect
Shared by Krabby