He's desperate, his thoughts are bottled
Inside him,

from Eminem (Ft. Kobe) – Talkin' 2 Myself Lyrics on Rap Genius

Meaning

Eminem needed to release his thoughts about other rappers, but he didn’t do it.

Desperado is an alcoholic drink that comes in a bottle , which is what he could have meant when he says ‘his thoughts are bottled inside him’.

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