another name for a broken link on a web site. It's the opposite of a "hotlink", which is an internet hyperlink that actually works. Generally used in reference to links on the world wide web, but sometimes used to describe IRL relationships.
"Why did you send me that broken URL to your heli over IM? It didn't work, it was a total coldlink!"
"Date Michael? Uh, never, we're totally coldlinked."