When you are cuddling up against someone's butt (i.e. spooning), then that person is your Cuddlebum.
This term came to fruition and gained popularity from the show Will & Grace when one of the characters asked "Will you cuddle me bum?" and the nickname Cuddlebum was then given.
RANDOM GIRL: I'm lonely and cold; I need someone to cuddle me bum!
when you put a book in the oven at 3 am and it catches fire and the whole house is burning down and your family is dying and your mom's last word was 'this is why I should've aborted you' and you get to heaven and meet god and he says 'I regret inventing the earth'
when two people (usually friends or lovers) turn around so their rears are facing each other and then proceed to shake their bootys at alternating right angles to the direction they are facing.