An anecdote intended to be humorous but actually in very bad taste, as in His stories turn out to be sick jokes about people who are handicapped in some way. [Colloquial; mid-1900s]
Words nearby sick joke
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.