Strong, baby tell me what's been goin' on, I don't wanna be sober long
So you gotta get me high again,

from Mac Miller – The Mourning After Lyrics on Rap Genius

Meaning

He wants her to make him fall in love again and give him that feeling of happiness

Previously he said

She make me feel like how them drugs work.

He’s lost that ‘high’ for her and he wants it back.

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