An aggressively throbbing dick is the male genital shaking aggressively.
Kid that lives down the road: Whats a aggressively throbbing dick?
Man: When you make you silly little penis shake aggressively.
The sound a human emits when they happen to experience pain or pleasure.
There are many ways to word a moan.
"Ngh", "Ah" "Oh" are only a few examples.
"Oh god, the woman who lives upstairs sure did moan last night!"
"She was having so much fun."