A Jugasaurus-Rex is the name given to a female with extremelylarge breasts.
The phrase was made famous by Neil from t.v show 'The Inbetweeners' where he spots a girl in the park and says, 'Hey guys, look at that Jugasaurus-Rex!'.
'Hey Lewis, Jugasaurus-Rex at 5'o'clock!'
'Woah, Your a right Jugasaurus-Rex!'
'Don't you think that PamellaAnderson is just one huge Jugasaurus-Rex?'
he that believeth in me, though he were dead, yet shall he live: And whosoever liveth and believeth in me shall never die or ill go Jesusaurus rex on yo ass!