And we only give our number to selected few
And it's best that you never knew what good head'll do

from The Notorious B.I.G. (Ft. Diddy & Too Short) – The World Is Filled Lyrics on Rap Genius

Meaning

He’s only giving the very best ladies his number, ones who very good at, well, sucking dick. Very effective way of determining who get’s to put your number on their phone.

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