LAIM

Acronym for League-Average Innings-Muncher.

LAIMs are typically soft-tossers with mediocre stuff who will get knocked around from time to time, but are just effective enough to stay in the rotation and rack up a lot of innings as a 3rd or 4th starter. (See: Paul Byrd, Jeff Suppan, Dave Burba, Steve Trachsel, Sidney Ponson, Charles Nagy, Rick Helling, et cetera, et cetera.)

These pitchers will often have terrible years (>5.00 ERA), but always manage to stick around and post average numbers in subsequent campaigns. They are the filler of every MLB team's rotation -- they're rarely pretty to watch, but you have to have at least 2 of them on your roster to survive.

The acronym was originally coined by baseball Blogger Travis Nelson in 2003:

http://boyofsummer.blogspot.com/2003/12/flashes-of-adequacy.html