I looked it up for you…
ga·lah
/ɡəˈlä/
noun
noun: galah; plural noun: galahs
- a small Australian cockatoo with a gray back and rosy pink head and underpants, abundant and regarded as a pest.
2. (slang) a term commonly used to refer to most posters on the HotCopper website, of which many are also regarded as pests.