I been a legend since...
In the foetus, Beat all the sperm,

from Lil B – Die For Me Lyrics on Rap Genius

Meaning

Lil B has been a legend since he was a foetus.

“Beat all the sperm” < This is a reference to the process of a women becoming pregnant. At the end of intercourse a man shoots his sperm into her vagina and from there its pretty much a race to see which sperm gets there first. Lil B was the winner.

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