Top Definition
When you wish Happy Birthday to someone by copying what someone else (who you don't know) has posted on your friends wall. Ideally, this will be some inside joke that you know nothing about, be slightly personal and a little bit weird.
Facebook Birthday Bombing is doing this to a girl/boy you kind of know, don't really know what she's up to and don't intend to see anytime soon...

"Happy Birthday Babes!!! WONDERFUL to see you last week, hopefully this weekend at Ollie's will be megabants!!! xoxoxoxox P.s. Ibiza 2k8. Always remember it!!"
by The Banter Bus October 31, 2011

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