Generally, if you are a male, any use of this directed at you is a good sign; its a flirty, suggestive word choice (similar to the sound of a kiss), and when used with males it almost implies a sort of lustful blushing. It suggests that said female finds you fun, and is comfortable being playful with you.
jen: i guess im just better than u at everything mwahaha
2. kelly (emailing diana): omg diana your new hat today - SOOOOOOO cute, you were better than a giant mushroom with an aluminum bat whacking a dancing hippo in court!!!!!!!!!!!