Top Definition
when females partake in the use of marijuana smoking, particularly, when only in the presence of other females. smoking is often accompanied with other feminine activities such as eating chocolate, painting nails, watching chickflicks, etc. word origin: pretty + greening.
S: What are you up to tonight, homegirl?
I: Oh, me and the gals are going to be preening. Care to join?
S: Sure! I'll bring a romantic comedy.
by sharmina December 09, 2010

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