We, Japanese like to abbreviation. It is easy to say or memorize. Abbreviation was a kind of trend for young people. However, we, adults say these words not only young people now.
For example, we call family style restaurant like Denny's "Family-restaurant". "Fami-res " is abbreviation of "family-restaurant". "Con-veni" means convenience stores.
MacDonald's is called "Mac" or "Mac-do" (Mac-do is used in west area of Japan.) "Mel-tomo" means friend for e-mail. ("Tomo" or "Tomo dachi" means friend in Japanese.)
These words are used in daily life in Japan. If you have Japanese friend, please say these words to him or her. He (she) will surely very surprised.