A generic insulting noun, coined by Butt-Head of MTV's Beavis and Butt-Head who also gave us words like, "fartknocker", "buttknocker", "Cornholio", "TP", "bunghole" (the asshole, not a hole in a keg), etc
{Beavis}: What was that, Butt-Head?
{Butt-Head}: Oh just some bungknocker on TV, twirling these big dumb sticks, lighting them, twirling them again, and like setting himself on fire or something.
A person who initiates intimate behaviors with a significant other based solely on having sex with their body. They admire their physique, but prefer not to get involved farther than that. The person may also lack characteristics that make them attractive(i.e. nasty face, awful personality).
Dude 1: You had sex with that girl just cause she had a sweet bod?
Dude 2: Yeah, I'm a fuckin' bodyknocker, broseph.
A Bongknocker is an entity (human or animal) who would rather run through your bong, knocking it over, spilling the water and potentially breaking it, as apposed to walking around it respectfully and gracefully.
"Who spilled the bong!? ROXY! You BONGKNOCKER! BAD DOG!"