ICQ n (Communications & Information) trademark an instant messaging computer program that enables internet users to locate and communicate with one another online [approximate abbreviation of I seek you]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014