I *blanked* your mom. (Use another member's username game)
Okay, here's how it works. I've already thought of a thousand good ones, so I will use an obscure example.
I Hikered your mom.
Or......
I Backfired your mom.
Okay, I just gave away two fabulous examples. Use someone's username to explain what you did to a mom. You don't have to totally stick to the true username, for example . . . . i.e. -- If there were a person here usernamed Serpent Banger, you could say . ... .. "I banged your mom."
Or .. .
"I serpented your mom." Something like that.
I'll go first.
I Blackc@tted your mom!