n. Something unexciting or boring that induces yawning, as a book, sporting event, or performance.
The Century Dictionary and Cyclopedia
n. One who yawns.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who yawns
Word Usage
"Saying a NFL division match-up with playoff implications is a yawner is a pretty big stretch, especially considering how physical the Giants and Eagles are."