What does "dream on" mean in the dialogue? "Listen, Sally! I'm not a wimp! But he's put people in hospital before now... and I'd rather not be the next one." "Oh come on, he hasn't really!" "Dream on! But I know he has, 'cos I happened to be in the wrong place at the wrong time once.... And he saw me. Now I'm not going to say any more about it. But if I were you, I'd try an' stay on the right side of Snoo."