the GNU version of the Collaborative International Dictionary of English
n. One who whacks.
n. Anything very large; specif., a great lie; a whopper.
The Century Dictionary and Cyclopedia
n. Something strikingly large of its kind; a big thing; a whopper.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. something especially big or impressive of its kind
Word Usage
"Now, if you have ever been fishing, you will not wonder that I was led on, forgetting all about danger, and taking no heed of the time, but shouting in a childish way whenever I caught a 'whacker'"