Alexa, What is a Beemer?

My 1961 BMW R50/2 motorcycle is a Beemer. On the other hand, the 4-wheeled vehicle you drive with a blue-and-white roundel on the hood is a Bimmer. Now that she's in bed with BMW, Alexa needs to brush up on her nomenclature.

from
https://www.soundandvision.com/content/alexa-what-beemer