1. To bitch about someone nastily in your blog. Usually used when extremely pissed off with a person.
2. To be used on someone who never stops ranting and ranting and just wouldn't shut up even though you don't even care about his/her problems. Great way to tell them to shut up politely.
1. "That skank totally ruined my day! I'm sooooo gonna bitchblog about her as soon as I get home."
2. Girl A: Seriously, I've never been so pissed off in my life! That bitch totally kissed my boyfriend in front of me! And-
Girl B: Yeah? Well, you should bitchblog about her.
Girl A: Yeah, I totally should! Everyone must know about this scandal.