The Gabba is where they play world class test cricket.
A Gabba is where someone plays a bit of suburban footy.
Meanwhile a Yabba:
"Stephen Harold Gascoigne, better known as Yabba, (19 March 1878 - 8 January 1942) was an Australian sports fan, remembered as a heckler at Sydney Cricket Ground cricket and rugby league games in the early part of the 20th century. Yabba was known for his knowledgeable witticisms shouted loudly from "The Hill", a grassy general admissions area of the SCG. In Yabba's era, cricket matches were watched like tennis matches, and spectators at the SCG were much quieter than today. This is the reason Yabba's comments were so clearly heard by players and other spectators." (from Wiki)
Also a cool post rock song by the band Battles from the US inspired by Australia - maybe it had something to do with the SCG Yabba, maybe they misheard Yabbie, I don't know:
https://www.youtube.com/watch?v=bkhLzHuUYmo
(Don't know how to embed, but anyway - just a random word association exercise that worked out strangely appropriate, in some wacky way.)