Visualising the entire boobs after looking at a part of it. Probably of a boob you haven't fully seen before.
Man 1: Look at this hottie
Man 2: Damn, what a nice booty.
Man 1: Well man forget the booty, I can't help but titsualise
A shitty situation for everyone except Sean Connery
Guy1: I got caught wanking in the exam hall
Guy2: Sounds like a bloody shituation bro.