And I, nigga I'll kill ya, I'll chop ya up
Put ya inside the mattress like drug money nigga

from Jay Z – Threat Lyrics on Rap Genius

Meaning

Putting body parts in a mattress is a way of hiding the evidence… Putting drug money in a mattress is also a way for dealers to keep their money away from police during or raid or it can be used once the dealer gets out of prison so he isn’t broke… keeping money in a mattress is good way to be discrete because huge deposits in a bank may raise suspicion on where the money is coming from

To help improve the meaning of these lyrics, visit “Threat” by Jay Z Lyrics and leave a comment on the lyrics box