means A wallaby is any of various small to medium-sized marsupials native to Australia and nearby islands, basically a kangaroo's smaller cousin, that hops about on powerful hind legs.

from The word comes from Dharug, an Aboriginal language of the Sydney region, where it was something like 'walaba' — one of many Australian animal names (along with 'kangaroo,' 'koala,' and 'dingo') that English borrowed from the continent's First Peoples as colonists arrived in the late 18th century and reached for words to describe creatures they'd never seen.