Top Definition
A middle aged woman that would be defined as a cougar but is not attractive. In fact she is as ugly as a lagoon creature.

The lagoon cougar effect is dulled by alcohol intake. As the alcohol wears off and a hang over sets in the effect is intensified.
"I was having a great time last night had a few shots, a couple of beers and I was picked up by a horny middle aged woman. When I woke up in the morning I was in bed with a lagoon cougar."
by XeroX1978 September 09, 2009

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