Refers generally to cannabis-
based therapy but could also refer to other psychedelics, or more broadly to embracing nonchalance. Pending context, the expression could be an invitation to others to partake in an activity, or a declaration of indifference to one's carefree decision making. The expression is generally used without punctuation, similar to Marvin
Gaye's 'What's Going On', and is also seen abbreviated to WNM.