Used in text talk or on the net. ILYIMYIWY is the same as ily(I love you) imy(I miss you) iwy(I want you) but this is when you REALLY mean it. This is when you are in love with someone and you would do absolutely anything for them. It can be followed on by kisses at the end. For example in a text you could write something like:
Example: Anddi: Hellooooooooooo. How are you today?