See I'm an A1 type of guy
I crush A1 hoes (true)
Rock A1 clothes (true)
Drive A1 whips (true)

from Meek Mill (Ft. Kendrick Lamar) – A1 Everything Lyrics on Rap Genius

Meaning

‘A,’ being the 1st letter in the alphabet, and also the highest grade in the grading scale, and ‘1,’ being the 1st whole number with positive value, are both the highest valued in their respective categories (think of 1 as in 1st place, not 1 dollar per se).

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