This that slam, hide it under the mattress

from Vic Mensa – Yap Yap Lyrics on Rap Genius

Meaning

Slam is a slang for guns/weapons,. This is a metaphor relating the weapons/“heat” to his music which is “hot” or good.

Lupe Fiasco has been using a similar comparison, instead with drugs, in songs/tweets leading up to his Tetsuo & Youth album — specifically on “Peace of Paper/Cup of Jayzus”

Also, a mattress is a common place to hide things under, especially money.

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