(noun) The opposite of the unicorn chaser. When one is overwhelmed by cuteness, one feels that only punching a unicorn in the face can re-establish balance.

Verb:

It's a blind surprise attack that desecrates the victim in a way he or she never knew was possible.

Accomplished by simultaneously lowering the head and extending the arm (fist clenched) in front. This gives the impression of a unicorn with your devastating fist as a horn.