Winston Churchill used this term to refer to his depression

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.

n. (possibly of Irish origin): A bad mood, characterized by anger, depression, or a mixture of the two. Emotional malaise. An antisocial mood. Sometimes synonymous with a 'purple rain.'

A kick-ass song by Led Zeppelin that famously starts off with the lyrics "Hey, hey, mama, said the way you move // Gonna make you sweat, gonna make you groove!" sung in acappella by Robert Plant, just before Pagey and Bonzo kick it into high gear with the lead guitar and drums, respectively.

The song supposedly got its name from a stray black dog that kept walking in and out of the studio while the song was being recorded.

melancholia, depression

Song by Led Zeppelin that rocks. However, it never once mentions "black dog". Probably named so because of the afore-mentioned definition. So I guess it makes you feel like that. Or because Robert Plant was on crack. That crazy bastard.

To kick a pirate - like character, a genuine scoundrel, out of a tavern after he orders a double rum. When caught they must be physically harmed in some manner. Time of origin: 18th century Britain. Popularized in the classic Disney movie Treasure Island.