The act of carving a melon into the shape of a 4' long erect penis and inserting it anally into your co-workers and or friends during a sleepover at your grandmothers house.
A moonbomb is essentially a photobomb in which the photobomber removes his pants and directs his barebottom towards the camera. This results in a photobomber mooning the camera thus creating a moonbomb.
In the background of our picture, you can seeJack photobombing, but he couldn't just do it normally. Instead he had to moonbomb the camera with his hairy ass.
(Verb) To forget something that was just said or told, especially when asked to recall it shortly after, often because you weren’t paying full attention.
A: "When the teacher asked me to repeat the instructions, I memobombed and couldn’t remember what she just said."
B: "She asked for the meeting time, but I memobombed and had to check my notes."
C: "He memobombed the directions right after hearing them and had to ask again."
Casual:
A: "I got memobombed"
B: "Wait, what! What was that? Oh.. I got memobombed"