Now let's pray that arm candy
That you left your ex for stay down and come in handy

from Jay Z (Ft. Bilal) – Fallin Lyrics on Rap Genius

Meaning

You better hope that broad who you left your main girl for sticks with you through your stint in prison.

She’s so fine, hopefully she’ll come in “handy”. (You’ll be using that a lot while locked up)

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