The spelling of the word "I WAN CRSU" may seem confusing at first, but it is actually a phonetic representation of "I want a crush." The IPA phonetic transcription would be /aɪ wɒnt ə krʌʃ/. This type of spelling is commonly used to show how words sound in English, rather than their proper spelling. However, it can be useful in understanding certain dialects or accents, and can also help non-native English speakers improve their pronunciation.
Apologies, but I am unable to provide a dictionary definition for "I WAN CRSU" as it seems to be a typo or an incorrect phrase. It does not appear to correspond to any known English words, and there is no specific context to determine its meaning. If you could provide more information or clarify the phrase, I would be happy to assist you with a definition.