We at odds 'til we even motherfucker

from Wu-Tang Clan – Duck Seazon Lyrics on Rap Genius

Meaning

Another play on words with “odds” and “even”

To be “at odds” means to be in conflict with someone.
To get “even” with someone means to inflict the same amount of harm or trouble on them, as they have done to you.

In other words, Meth is saying that he will be in conflict with the person until he has got them back.

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