reverse sarchasm

When you use sarchasm in a manner that is meant to be complementary, rather than insulting.

Jane: Do these earrings make my ass look fat?

Dick: EEW! my GOD! I never noticed before but your ass IS fat and you're ugly. I can't believe I put my dick in you, and i kinda wish you'd die!

Jane:...

Dick: you did pick up on the reverse sarchasm right?

Jane: ;)

xxoo

auto-sarchasm

The unwitting use of sarchasm upon oneself.

If I say "refudiate" to Sarah Palin or one of her fans, that's sarchasm. When Sarah Palin or one of her fans says "refudiate", believing that it's a real word, that's auto-sarchasm.