“The term "beemer" started as an acronym for the abbreviation "BMW," adapted from the early-20th century British pronunciation of BSA (as /ˈbisə/ or /ˈbizə/), whose motorcycles were often racing BMWs. Over time, the term became closely associated with BMW motorcycles.

In the United States, the term "bimmer" was later coined to refer (exclusively) to BMW automobiles. As such, use of the word "beemer" to refer to a BMW automobile is frowned upon by some BMW enthusiasts, because it is the term used for motorcycles. Although the distinction is completely arbitrary, to this day, the media, movies, and most people still use the term "beemer" to refer to the automobiles.

The initials BMW are pronounced /beː ɛm ˈveː/ in German. The model series are referred to as "Dreier" ("Three-er" for 3 series), "Fünfer" ("Five-er" for the 5 series), "Sechser" ("Six-er" for the 6 series), "Siebener" ("Seven-er" for the 7 series).”

_____________________________________
Exedy Clutch