Freeleech

Freeleech is something applied to a torrent that makes download stats not be recorded (or at least counted on your download amount) at all, so the torrent is free to leech hence the term freeleech. Freeleech can be applied to individual torrents at a trackers own discretion, sometimes for really big torrents, internal encodes, torrents that are underseeded, and sometimes there are freeleech periods in which for a certain time frame all torrents downloaded wont count towards your download amount.

Hit and run conditions still apply so torrents can't be removed from the client until it has been seeded for enough time.