To become part of an official group or organization without invitation by simply continuing to show up at the group's events and/or place of business

A euphemism for “kill me” now that composting oneself after one’s death has become popular.

Passive person, usually a woman, who unreflectively acquiesces at ones request.

Mariah Carey's army of venerable, lunatic fans that think that they are in some exclusive club because Mariah mentions them frequently. They think that this is still 2001 and she needs to be constantly defended even though she proved her maturing mental attitude to the world with Emancipation of Mimi in 2005. Lambs are clearly mentally stuck somewhere between the Daydream and Charmbracelet eras. Lambs are obsessed with the so-so Butterfly album and tend to love the same boring midtempo cuts that Mariah does. Mariah is known to constantly reference songs like 'The One' and 'Babydoll' on her Twitter because the Lambs eat it up. She also ropes her psychotic fans into the warped urbanized concept of "haters". Even normal non-Lamb fans are considered "haters" because their concept of Goddess Mariah is not on the verge of the Lambs' cult membership.
They are also known to shell out $90 for the fanclub Honey B. Fly which sends out the member packet a year after the subscription lapses.

A person who is cool; a name for someone your cool with

Gwen Stefani's (orginaly of the band No Doubt)clothing line. LAMB stands for love angel music baby.
this is also the title of her latest album.

Gwen Stefani's AMAZING Love, Angel, Music, Baby - clothing line.
L.A.M.B. is the stylish line of clothes launched in 2004, available to buy online and in selected boutiques and department stores.