VERB + INFOHAZARD
head
INFOHAZARD + NOUN
meme
ADV.
then
noun
A piece of information which is directly harmful to one who knows it.
A basilisk, in this context, is information that can hurt you simply because you are aware of it. Yudkowsky uses the term 'infohazard'.
If a meme is any idea that gets in your head, then an "infohazard" is a meme that's actively harmful to its host.
An information hazard; a piece of information which can be used to cause harm by one who knows it.