Once in seven something

from Aesop Rock – Oxygen Lyrics on Rap Genius

Meaning

AES was born in 1976 (1 [once], & 7 [seven], something [six])

A possible Biggie reference, perhaps?

[http://rapgenius.com/43896/The-notorious-big-respect/Nineteen-seventy-something-nigga-i-dont-sweat-the-date-my-moms-is-late-so-i-had-to-plan-my-escape]

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