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1.
Blogjack is a G rated term for blogdick. Blogjack or Blogjacking is to post your comment under the first comment in a blog in an attempt for readers and the blogger to see your comment before reading other comments in the blog.

To cut in line inside of a blog.

To place a comment in a blog under another comment near the top that has nothing to do with the above comment.

Most popular blogs will have a blog jack or blog dick line see Miles Cole's blogs on myspace for a good example.
BlogJack line starts here

Blog jacking is allowed on some blogs but not on others.

"Mind if I blogjack?"
by Miles Cole November 01, 2009
 
2.
Occurs when two or more people hold a conversation in the comments of another person's blog. Usually the conversation has little or nothing to do with the topic of the blog.
Originates from the term carjack.
OMG I have been blogjacked!!
by murgatroid May 04, 2007
 
3.
When someone steals an idea from one persons blog and puts it on their own.
I blogjacked this from Leslie's site because it was really cool.
by NucmedisHot July 22, 2008