Top Definition
Older women who own their own pontoons (or other watercraft) and go boating exclusively in the company of women. They are known for their aggressive, cougar-ish tendencies and their habit of becoming loud, lewd and obscene by the late afternoon. The pontuna phenomenon was first discovered in Bismarck, North Dakota where the nouveaux riches spend their money on boats, naturally.
Randy: I hear the river is packed with pontuna again today. Let’s head over there and try to bag some.

Monte: Yeah. I’ll get a bottle of Malibu. Pontuna love that stuff.
by Nolybab September 24, 2012

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