mon·key·shine (m?ng?k?-sh?n?)n. Slang often monkeyshines A mischievous or playful trick; a prank: laughed at my daughter’s monkeyshines.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.monkeyshine (?m??k???a?n) na prank or trickCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014mon?key?shine (?m?? ki??a?n) n. Usu., monkeyshines. monkey business (def. 1). [1820?30, Amer.] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.