Referring to a person's mother in a positive way as a phat dog; this is why phat is used with a "ph" instead of just an "f". If you're mother has once before been called a "phat dog" one should feel complimented, and not confused with the term "fat dog" in which you should feel offended, nobody wants their mother being called a "fat dog".

Gerald: Urmumsaphatdog Ally
Ally: how dare you ! You must die
Gerald: i meant with a "ph" Ally
Ally: awww you're just the sweetest
Hello nice to meet you Jack, Urmumsaphatdog!
by Gweilo17 November 23, 2021
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