To take a picture or make a video (of you or someone else) licking a random object in an extremely sexual manner in the style of Miley Cyrus.
Guy 1: Why are you licking that lamp?
Guy 2: I'm cyrusing.
Guy 1: I guess you really love lamp.
To obsession over something to the limit where it's very creepy.
And then the singer was cyrusing over her over rated eos.