You're in the mood for empathy, there's blood in my pen

from Kendrick Lamar (Ft. Drake) – Poetic Justice Lyrics on Rap Genius

Meaning

A metaphor for the pain and heart he puts into his music. If you need someone to relate to or feel for you, he puts the life experience, blood, sweat and tears ‘in his pen’ — i.e into the music he’s created.

Black Hippy cohort and TDE label mate Ab-Soul has something to say about Empathy.

“Blood in my pen” is a euphemism for an erect penis and this lyric refers to the intense emotional experience of sexual intimacy.

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