CET = Central European Time (UTC+1). This suggests the event or file originated in Europe (e.g., Germany, France, Italy, Spain). During September 2011, daylight saving was active (CEST, UTC+2), but the keyword uses “cet” generically — common in logging systems that store time in standard time year-round.
In 2011, BitTorrent DHT (distributed hash table) entries sometimes contained random-looking keys. sexxyeryca might be an infohash prefix or a magnet link label. “New” could signal a freshly published torrent. sexxyeryca 2011 09 06 cet 18 new
Between 2008–2012, many adult or amateur video sites used automatic naming conventions: [username]_[date]_[timezone]_[time]_new. The word “sexxy” strongly suggests adult content. “Eryca” could be a performer’s name. 2011 09 06 cet 18 would be the upload timestamp. new indicates “new” version or “new” upload. This is the most straightforward interpretation. CET = Central European Time (UTC+1)
If you genuinely need to identify what this string refers to: In 2011, BitTorrent DHT (distributed hash table) entries