far out exclamation 3adjective 2forms 4 exclamation3 •(Australia, informal) An expression of surprise."Far out mate, look at the size of that bloody boat," a ranger said as he arrived at work at the Royal Botanic Gardens. — 2007 •(Australia, informal) An expression of displeasure."Far out mate, frustrated. It just didn't jump and get going early. She was back running third-last," Olive said. — 2018 •(informal, old-fashioned) Cool; great; an expression of support, enthusiasm, or celebration.Far out! The game has a hidden cow level. adjective2 •Very unusual, eccentric or unconventional •(informal) New, radical and extreme.We were discussing a new base for our office, but moving to Antarctica seemed too far out. formsmore far out · more far-out · most far out · most far-out