When performing oral sex on the anus and become surprised by the excrement on your tongue resulting in a similar appearance to the Australian Blue Tongue Lizard.
Aussie cunt #1: “Ahh mate had a shocker last night ya”
Aussie cunt #2: “Shit, what happened mate?
Aussie cunt #1: “So last night me and me misses tried eating ass and I turned into a Poo Tongue lizard”
Aussie cunt #2: “Haha.. well that’s shitty”
Aussie cunt #1: “Fuck off cunt”