It's not a cougar nor is it high-end soccer gear, but a political acronym you could have heard when Hillary Clinton halted the roll call and released her delegates into the wild. PUMA stands for "Party Unity My Ass," and, no, not the Democratic Donkey ass.
The term originated in the comment section of a pro-Clinton blog, and later became the name of a political action committee protesting Barack Obama's place as the Democratic nominee. The term later underwent a PC transformation and now officially means "People United Means Action."
PUMAs can be found protesting the Democratic National Convention in Denver, encouraging a Clinton write-in campaign for November, or voting for John McCain.