roo bar noun1 •(Australia, informal) A metal bar or framework of metal bars on the front of a vehicle to protect it during collisions with kangaroos or cattle.Mr Giles has even, rather whimsically, helped design his preferred vehicle: roo bar for those late-night mercy dashes, roof rack for swags, red hand-print (‘my hand’) instead of red cross on the side. — 2003 formsroo bars