I have always loved Cougars (the car, that is- this was before people called ***** middle-aged women cougars). My mechanic/racing buddies and junk yard operators can never remember my name, but they always remember my cars. So they always called me "cougar" or "cougar-man".
Back in the 90s when I joined AOL, your username could only be 8 characters max. "Cougar", "CougarXR", and "Coogar" were all taken, so I opted for "CoogarXR". It's been my online name, just about everywhere, ever since.