Can anyone tell me what linkdumping is?

Can anyone tell me what linkdumping is? I heard about it last night and not sure what it is.

Thanks.

"Link Dumping: Link Dumping is the Black Hat art of dropping a link to your sites everywhere that is humanly possible for little to no money. Common link dumps include guestbooks, comment sections, and link exchanges."

source- http://seoblackhat.com/category/link-dumping/