Cute Aggression is a dimorphous expression in which people feel a desire to bite, pinch, squeeze, slap or otherwise do things that would in most contexts be aggressive behavior, but which in the context of Cute Aggression, are expressions of affection.
Most people know someone who does this, to varying degrees, and in fact, most people have had the urge to do this, or have done this at some point.
Here's a nice little article on it:
So what's your story of cute aggression?
Mine is almost always dogs... I want to mush their cute little faces into a mass of wrinkles.