not your first Cangaroo 

When you want to become good at something, but you lack the necessary experience, knowledge, or skills to perform it at the level or standard you expect of yourself. This often creates a gap between your ambition and your current ability, leading to frustration or self-doubt until you gain more practice and understanding.

When the speaker made a grammatical mistake it was clear that English was not his first Cangaroo.
The person was visibly sad, because they didn't do well on their test, and I reminded them that this subject was not their first Cangaroo.
Tennis was at one point not your first Cangaroo, but now you are a proper can-can tennis player

not your first Cangaroo by FickleFeather September 8, 2025