The act of writing LOL for no reason on messageboards, ie you're a bit mental and just want to type for the sake of it.
Invented on Veloriders

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.