The act of taking a dead body, putting a bomg inside and blowing it up. Best used against the family of the deceased as a way of furthering their suffering.
"That muthafucka Clint's mom died a couple weeks ago. I'm gonna dig her up and necrobomb the shit outta his place."
Masturbating, knowingly or unknowingly, to pictures or video of a person who has passed away. (The pictures or video must have been taken while said person was alive, otherwise the act is sick instead of merely creepy.)
AmiJordandied last week? Why didn't anyone tell me? Shit, that means I've been necrobating all this time!