If you've ever received a text message from a girl that includes letters repeated for emphasis -- "hiiiiiii," "oh nooooooooo," and "wait whaaaaat?" come to mind -- then chances are good that she likes you. Girls often add extra letters to words as a way of showing that they're attracted to you and that they want to speak with you again.
Another reason why a girl might repeat the letters in her words is to show that she's being cheeky or sarcastic. She might be trying to prove that she really believes what she said, or she could be being sarcastic in order to make you laugh.
It's also common for girls to add extra letters to their words to show that they're sorry. For example, if a girl says "sorryyyy" in a text it means that she's sorry for something she did. This is an important part of communication, and it's something that many people fail to take into consideration when typing online.
