From Longman Dictionary of Contemporary Englishcougarcou‧gar /ˈkuːɡə, -ɡɑː $ -ɡər, -ɡɑːr/ noun [countable] 1 
HBAa large brown wild cat from the mountains of western North America and South America SYN mountain lion2 American English informal an older woman in a romantic or sexual relationship with a younger man
HBAa large brown wild cat from the mountains of western North America and South America SYN mountain lion2 American English informal an older woman in a romantic or sexual relationship with a younger manExamples from the Corpus
cougar• These include the grizzly bear, cougar, wolverine, wolf, coyote, and bald and golden eagles.• In California, cougars routinely are killed when deemed a danger to people or livestock.• Nothing was paved, little was fenced; the forests were full of cougars and the streams full of fish.• The measure is the latest chapter in a long battle over the status of the cougar in California.• In former times the cougar was more abundant than at present...• The cougar prevailed a little longer, though its bounty in Connecticut was last paid in 1769.• The cougar, however, still could be restored.Origin cougar (1700-1800) French couguar, from Modern Latin cuguacuarana, from Tupi suasuarana, from suasu “deer” + rana “false” 