(okay, really it refers to advocating for characters from the comic to hook up in a relationship, but the above is my headcannon and you should respect that. )
Where "advocating" may or may not include completely ignoring any and all evidence contrary to what the shipper wants to happen.
Example:
"I totally ship Voldemort and Lily Potter".
"...dude, at least one of them is dead."
"Yeah well, maybe Voldemort will resurrect her using incredibly dark magic!"
"They are on the opposite sides of the alignment spectrum, and... "
"She will totally fall in love with him because of how powerful he is!"
"That doesn't even make sense!"
"Yeah well you are missing the signs!"
Damn, maybe I should write this fanfic. You know, just to see how bad it becomes.