literally "Your mother". A derivation of yo mamma, used as a joke insult for any occasion. It doesn't have to make any sense at all and can be part of a phrase. Often used in a sexual context.
Bob: What'd you do last night?
Bill: Your Mother.
Bob: What did you think of that movie?
Bill: Your Mother
Bob: I'm getting tired of this.
Bill: Your Mother didn't get tired last night.
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