An expression said when one is excited, pleased, or pleasantly surprised. A lot of people sure came to the fundraiser, boy! Boy, that was a delicious birthday cake!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Boy!and Boy, oh boy!
phr. a sentence opener expressing surprise or emphasis. (This is not a term of address and can be used with either sex, although it is quite informal.) Boy! Am I glad to see you, Molly!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.