Uhh, Bomb ass head uhh 'til she can't blink

from Kendrick Lamar (Ft. Young Jeezy) – Westside, Right on Time Lyrics on Rap Genius

She’s giving him good oral sex (bomb-ass head giving) until she’s numb to it and figuratively can’t “blink”.

It could also mean in a less literal sense that if her head were to bomb she wouldn’t be able to blink

Note the body-part-centric wordplay in the line — putting the words “ass” and “head” back to back

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