userland n.

Anywhere outside the kernel. "That code belongs in userland." This term has been in common use among Linux kernel hackers since at least 1997, and may have have originated in that community (a sighting has been reported from the 1995 archives of a NetBSD mailing list, however).

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.