to appear to rise up [from somewhere]; to take form or definition, usually threatening to some degree. A great city loomed up in the distance. It looked threatening in the dusky light. A ghost loomed up, but we paid no attention, since it had to be a joke.
Definition of 'clickjacking'. clickjacking. noun informal. the practice of using a disguised hyperlink to direct an internet user to a website he or she does not wish to visit. Word origin of 'clickjacking'. from click (sense 5) + hijack.
It is also called session hijacking. Session hijacking is a security attack, carried out by an intruder, which attempts to insert commands into an active login session. The most common method of session hijacking is IP spoofing. In an IP spoofing, attacker uses source-routed IP packets that inserts commands into an active transmission between two nodes on a network.