word(s) to my mother
(informal) (v) to "swear on your mother's life" -- stating something that is true because if it was false, then you'd be offering up your own mother for death
A: Honestly, I didn't break that window!
B: I don't believe you!
A: Bro, word(s) to my mother!
B: I don't believe you!
A: Bro, word(s) to my mother!