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A face one makes where their chin becomes doubled, tripled, and sometimes quadrupled while flapping your hands around and making strange noises. Often used in photographs.
For this next photograph, Sarah, do the wallaby it'll make everyone laugh at you.
Wallaby by Carlsss October 26, 2011
What comes out of Jean-Claude Van Damme's mouth when he tries to say "wannabe"
"I'm going to get in my boat, and I'm going upreever, and I'm going to kick that son of a bitch Bison's ass so HOARD - - that the next Bison wallaby is gonna fillit"
Wallaby by Legendary Pusshole October 10, 2009
Euphemism for "Whiny Little Bitch." Obtained from the accronym WLB.
He/she is such a wallaby.
Wallaby by Lassen September 5, 2011
A cute lizard with a chonk tail and so very handsome he charm all the ladies.
Sai: I have a cute little wallaby

Rio: aww man I’m jelly, I wish I had a wallaby
1. a penis ( slang )
"watch out for his wallaby", "quit pointin your wallaby at me!", "shiet you dont know about his wallaby"!
wallaby by elizabeth October 15, 2004
Wallaby is a nickname or name for someone who is considered petite, or small, and very affectionate. Some use the term wallaby to define small animals such as rodents,birds, and reptiles, but it is most commonly used for leopard geckos, bearded dragons, and rhinoceros iguanas.
My pet leopard gecko is such a Wallaby!

My bird is the worst Wallaby, he bites my fingers in affection!
Wallaby by Dr. Wallaby Jackson March 30, 2022