Kendrick Lamar kicks fan off stage
Grammy-winning rapper Kendrick Lamar headlined the Sweetlife festival in Maryland on 31 MayChris Weeks/Getty Images for Reebok

US rapper Kendrick Lamar expects everyone at his concerts to know the words to his songs so he was horrified when a supposed superfan messed up his lyrics on-stage.

The Bad Blood hitmaker was headlining the Sweetlife festival in Maryland when he invited an audience member to join him on-stage to rap along to his 2012 track m.A.A.D. city.

However, the invitation was based solely on the condition that the superfan knew every single word to the lyrically complex song.

Initially confident about the task, the festival's co-founder Jonathan Neman thought he had what it took to wow the audience but instead, the businessman left them stunned when he stumbled on the first line.

After awkwardly stuttering on the words, Lamar, 27, waved at his band to stop the track before enlisting security to escort Neman off the stage.

The hip hop icon told the audience: "For some reason, every time I bring up a young lady up here, they always outdo the men who come up here," before introducing a woman named Ayanna to the stage.

Watch Kendrick Lamar kick the festival co-founder off the stage:

Ayanna proceeded to expertly deliver the lyrics without much assistance from Lamar, prompting huge cheers from concert-goers and perhaps rubbing salt into the wound for Neman.

Following her impromptu performance, the Swimming Pools rapper applauded Ayanna for her effort, admitting: "She killed that s**t. She not only represented what I do, and I truly appreciate that, but she represented every one of y'all out here tonight."

Although Neman was unable to master the lyrics, he is clearly a fan of the Grammy-winner as his Sweetgreen company named their salad, Beets Don't Kale My Vibe, after the musician's hit single, B***h Don't Kill My Vibe.

Lamar is set to embark on a North American summer tour in promotion of his latest chart-topping album, To Pimp A Butterfly.

The rapper was recently honoured with California's generational icon award in light of his generosity in helping underprivileged children in the Compton community.