High confidence (usually 20+) means dozens of other people have ripped the exact same pressing and your data matches.
The phrase is more than a search query. It is a declaration of intent. It signals that the listener rejects the convenience of a streaming service (where Slip It In often appears as a murky 128kbps AAC file missing the rawness of the original) and refuses the fetishism of vinyl without the practical fidelity of digital archiving. Black Flag - Slip It In -1984- -EAC-FLAC-