Sitting at a typewriter at home, Hillebrand typed out random sentences and counted every letter, number, punctuation, and space.
Almost every time, the messages contained fewer than 160 characters, thus giving the basis for the limit one could type via text messaging.
They're on the verge of being called, 'adult emoticons'. Some people might think they're adult emoticons because they're rude emoticons - dick head, finger msn smileys etc.
They think they're soooo smooth and they want to show it. These adult emoticons illustrate rather unsatisfactory behavior.
The term originally referred to messages sent using the Short Message Service (SMS).