A popular variant spelling of lurk more. It is an expression used when someone demonstrates their ignorance of the customs and social expectations of an online community, or otherwise makes an idiot of themselves online. Its use indicates that the person so instructed should gain familiaritywith the community before posting further.
annoying_n00b: LOL @ my genius! I am the greatest! Surely everyone loves me by now.
everyone else: LURK MOAR
Faking a terminal illness or death on the internet. May be done for the lulz, or to get attention and small gifts such as lip gloss. A pseuicide usually divides a group of friends into believers and non-believers.
Someone posted saying Josh died in a Murphy bed accident? That's gotta be a pseuicide.