I might (might) just put you on the chopping block tonight
Act right and you can get my second string spotlight
But if you freaking, I'm speaking clean as a whistle
This'll be the last offical offer before dismissal

from Big Boi – Back Up Plan Lyrics on Rap Genius

Meaning

Even though Big wants to move on to another chick he still wants to maintain a understanding/relationship with this woman for the occasional hook up.

He’s also admitting that he’s leading her on since he’s prepared to break up with her as soon as tonight. The chopping block metaphor is similar to saying that something is about to be eliminated or get “the axe”.

Stringing her along further and adding to the insult, he says that she could earn the status of his “second string spotlight” likening her to the substitute players on a sports team

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