Nothing. Usally used to answer a question given by a friend. Can mean none too. Great for conversations with people who you want to confuse. Never explain the meaning to parents. Just dont.
1. John: What did you get on the assignment?
Rebecca: Bubkiss, i didn't hand it in.
The start of the whole lolrus thing on I can has cheezburger; a walrus has its bucket stolen by its keeper. Now showing on every bloody corner of the internet.
I has a bukkit... nooooo they be stealin my bukkit