boomerang (n.) Look up boomerang at Dictionary.com
"missile weapon used by Australian aborigines," 1827, adapted from an extinct Aboriginal languages of New South Wales, Australia. Another variant, perhaps, was wo-mur-rang (1798).
boomerang (v.) Look up boomerang at Dictionary.com
1880, "to throw a boomerang," from boomerang (n.). Figurative sense "fly back to the starting point" is from 1900.