To dream of a milkshake represents people or situations that make you feel totally complete. Something that makes you feel like you have everything you need. A common symbol for our feelings about lovers or ex-partners who make you feel complete.
Example: A young man dreamed of sipping on a milkshake. In real life he had been remembering an ex-girlfriend who was very nurturing and caring. The milkshake reflected the warmth and charm he felt from her when he remembered how complete she made him feel.