G Herbo's 'Superstar' Challenge Doesn't Amuse Usher

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G Herbo recorded himself hitting the high notes from Usher's famed "Superstar" challenge Tuesday night — and it elicited a cryptic jab from the R&B star himself.

Herb kicked things off by light-heartedly posting to Instagram that he could sing better than Usher on his "worst day."

Clearly, Usher wasn't amused 'cuz he responded with a 🧢 emoji, which means "You're lying." Of course, the legendary crooner has good reason to be a little irritable ... he recently paid homage to his grandmother, who died earlier in the week.

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