"you don't know me"
From Interdex, the community-edited guide to the local internet.
"You don't know me" is a catchphrase that sprung out of ABS Forums when people started insulting idiots who used it as a serious comeback. Tenebrae Vision probably also wrote an essay once about how it's stupid which enforced everyone's dislike of it. Now it's sometimes used sarcastically, and if someone uses it seriously the ABS population won't hesitate to point it out.