When two computers want to have sex with each other (and not catch a virus), they must enter safe mode before proceeding with the act. Otherwise, the computers could Blue Screen and completely mess up their hard drive.

(This definition applies only to computers running Windows. Mac/Linux users need not worry about safe mode before letting their computers have sex).

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)