A Spencerbomb is when someone hides with the express goal of taking a photo of an individual in certain situations, ie, waiting in line, in order to send to said individual, while said individual is still in that certain situation without being seen.
I did a great Spencerbomb today. Took a picture of Barry waiting in line and sent it to him. The looked on his face when he got that photo of him in the same spot he was in was great.