when somebody keeps interrupting your talk by saying your mom, the phrase "your ancestor" will be the best way to shut his/her mouth because there's no way that person will reply back with the bigger word
A: your mom
B: (says something)
A: your mom
B: (says something)
A: your mom
B: your ANCESTOR!
by Jay Shim May 24, 2004
the worse comeback ever, reminds me of brokeback for some reason
uncool Dude: what we doing tonight jim?

Jim: your mom! (stupid but rightous laughter)

uncool dude: your ancestor

jim: what the hell was that?
by andy vale July 23, 2006

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