How the hosts use it
'Clean' means no hints. The hosts mock it, and Ep. 74 has them joking about saying 'righteous skill' in reply.
Why fans love it
A tiny daily puzzle triumph gets treated as a major flex, and Andy is shamelessly proud of it. Seth bringing it up to needle him, 'clean' as a badge of honour, and the endless slang offshoots all add to it.
Written by the AI from the transcripts. Every sentence was checked against them, one by one (the full episode transcript wherever a sentence names one); 8 sentences that failed the check are left out. How the check works.