Epic Birthday Bomb is when you, and possibly a few friends, start leaving fake birthday wished on someone's social networking profile in hopes that others will unknowingly follow along.
This acts as A) An annoyance for the person receiving numerous status updates when it's not even their birthday, and B) A nice way to past time at your otherwise boring ass job.
Dave B: Did you see how many idiots thought it was really Rob's Birthday when all they had to do was look on the information section?
Jeannette B: TOTES! Epic Birthday Bomb!