Interjection
your mom
(derogatory, slang, chiefly US) A general-purpose insult, often used to comedic effect due to becoming stale.
Conrad: I am not sure if this phrase is commonly used...
Dominic: Your mom is commonly used.
Student 1: Why are you being such a douche about it?
Student 2: Your mom. [intentionally nonsequitous type of use]
You look younger than him, wow!' wrote one, while a second penned: 'Your mom looks younger than you.' Source: Internet
Your mom character in the show uses a landline. Source: Internet
“Your mom is cool,” a passerby says. Source: Internet
Your mom will love her very own cake decorating set so she can attempt to “nail it” in her own kitchen. Source: Internet