I ain't for squishing, that's a problem to the wheel well
Trust I know them 20's real well

from Clipse (Ft. Pharrell) – When the Last Time Lyrics on Rap Genius

Meaning

Squishing = Having too many people in the back seat of the car. This would cause his 20 inch rims to scrape against the inside of the wheel well, causing damage

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I ain't for squishing, that's a problem to the wheel well Trust I know them 20's real well

I ain't for squishing, that's a problem to the wheel well
Trust I know them 20's real well