From Urban Dictionary: Comment Jump
(v): to disregard, not acknowledge, or skip over a comment when replying on a post or status update.
Did you see when George comment jumped me!? I can't believe he ignored me like that, I thought we were friends.
Stephen just comment jumped Angelina. He has been avoiding her since last week.
Christina: Don't you just hate it when someone you don't like comments on a post, but there are other people you want to comment back to?
Drake: Just comment jump them!