Until I met Top Dawg, told Dave that he'd like to meet
Me at the studio, made me freestyle for an hour
Told me come back tomorrow, but I came back in a hour

from Kendrick Lamar – Last Real Nigga Alive Lyrics on Rap Genius

Meaning

Around this time, Kendrick was just meeting top dawg. Tod dawg is the head of the record label Kendrick is signed to: Top Dawg Entertainment

Top Dawg had Kendrick freestyle for an hour, and top dawg told him com back the next day, but kendrick apperently had more freestyling/recording to do

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