Trunk tight, trunk white,

from Pusha T (Ft. Wale) – Only You Can Tell It Lyrics on Rap Genius

Meaning

He keeps cocaine (white) in his trunk. In case he gets pulled over by a cop, he keeps the trunk locked so that the police wont be able to search it. Maybe he learnt that trick from Jay-Z’s 99 Problems:

Well, my glove compartment is locked, so is the trunk in the back
And I know my rights, so you gon' need a warrant for that

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