AFAIK it’s been a challenge some people did on… twitter I think?
Basically it’s “Tell me you’re XYZ without telling me you’re XYZ” and people responded with funny answers.
At some point that got turned around and people satrted to use that sencence structure to indicate that the thing they are commenting on would have been a great answer for that challenge.
Crazy that you managed to snap one in their natural habitat.
I heard they are exceptionally rare these days.