spimsimilar to spam but it attacks users through instant messagingAbused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embreespim (sp?m)n. Unwanted, unsolicited instant messages, often of a commercial nature.[sp(am) + i(nstant) m(essaging).]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.spim (sp?m) n (Computer Science) unsolicited commercial communications received on a computer via an instant-messaging system[from sp(am) + i(nstant) m(essaging)]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014