This is what happens, when you want to express your emotions while chatting on Facebook or Skype, but mistype coincidentally. This is an example of modern "Freudian slip".

A Freudian slip, also called parapraxis, is an error in speech, memory, or physical action that is interpreted as occurring due to the interference of some unconscious ("dynamically repressed"), subdued wish, conflict, or train of thought. The concept is thus part of classical psychoanalysis.
(http://en.wikipedia.org/wiki/Freudian_slip)

Mistyped examples:
1) Kiss
2) LOL
3) Smile
4) Sad