The act of internally vandalising another persons unlogged out facebook page. This may involve changing any or all of the following: status, profile pic, relationship status, info column, comments, pages joint, etc.
Generally the greatest facebook bombing involves changes such that much of the user's friends don't realise the foul play involved.
An Atomic facebook bombing is similar but involves changing as many things as possible in the most offensive way possible.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

The act of writing a totally unrelated comment to someones posting.

to go back several months and comment on someone's wall