internet sarcasm 

1. Heavy handed, obvious.

2. Non-existent.

I can't tell whether he's being sarcastic or not. Well, that's internet sarcasm for you.

internet sarcasm by Xylemicarious January 9, 2009

sarcasm on the internet 

Sarcasm on the internet is like winking on the phone.

On chat...

Girl: I really like you.
Boy1: Really?
Girl: Yeah.
Boy2 PM-ing to Boy1: Watch out, remember the sarcasm on the internet thing.

sarcasm on the internet by Barracuda47 October 1, 2008