1. Abbreviation for the phrase 'hot mess walkin''.
2. 'Hot mess walkin'' n. - Usually a female (with some regrettable exceptions) who is under the (false) impression that she is attractive. Usually seen wearing an odd assortment of clothing items which are a few sizes down from the size she should normally wear.
See: Amy Winehouse
*In Forever 21*
Manager: Did you see that woman? She was a hmw
Sales Associate: A what?
Manager: A HOT MESS WALKIN! Mmm mm girl.