Stickiest meaning : Able or likely to stick. Potentially difficult to escape from. Of weather, hot and windless and with high humidity, so that people feel sticky from sweating. (of a setting) Persistent. (of a window) Appearing on all virtual desktops. (of threads on a bulletin board) Fixed at the top of the list of topics or threads so as to keep it in view. (of a website) Compelling enough to keep visitors from leaving.