Blow to the head is fatal
Wait til, you get a load of me
Taking a literal blow to the head can kill you
The blow job she is giving his penis (head) is so good, it might kill him.
This connects into the load statement in the next line which is also a double entendre:
She hasn’t experienced (or gotten a load of) head as good as what he can offer.
She is going to get a load of cum to the face at the end of the blow job.
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