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This can stand for a Manual 6-speed transmission, with M standing for Manual.

There is also a BMW M6 model, available in coupe or convertible, which sports a 500hp 5.0L V10.
My M6 goat would romp on your Cobra anyday
by yungstunna August 18, 2007
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Greatest Model of BMW ever made. V10 engine 500 HP! 0-60 in just over 4 seconds. top speed is just over 200mph / 300kph avg price $100,000 USD
The M6 is one beautiful car
by fatslobberingdrunk September 20, 2007
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Longest (and normally busiest) motorway in the UK. Runs between Rugby (where it joins the M1 to London, and the Scottish border near Carlisle. The road continues (under the number M74) to Glasgow.
The road passes through the major industrial conurbations of the West Midlands (Birmingham) and the North West (Liverpool and Manchester).

The West Midland section (previously the busiest stretch of road in Europe, incorporating spaghetti junction) was bypassed in 2003 by the UK's first toll motorway, the M6 toll.
'There's a severe jam on the M6'
by oracle January 28, 2006
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A Sports coupe made by BMW has the same V-10 500 BHP engine as the BMW M5 and the body of a BMW 6 series. While the M6 is quite fast and well priced the car has been criticised for its controversial styling and horrible iDrive system.
The only problem with the M6 is you always have to back it out of your friends driveway so they don't see its ugly arse end.
by DaRos January 29, 2008
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The new prefix of the mickey-mouse, so-called amateur radio foundation licence in the UK that is in reality no more than a multiband-CB licence. The Radio Society of Good Buddies (RSGB) were instrumental in its introduction and should be boycotted as a result. Most wannabes that hold M6 or the older M3 callsigns are either windie lickers, retards or chavs, or in some cases all three, and are too dumb to progress on to a real Amateur Radio licence. Some allegedly intelligent slackers even lowered themselves to the level of the M3 licence because they were too lazy to do a fairly simple morse test to achieve a full licence.
That 10W M6/M3 just beat me in a pileup, and I'm using 400W to a monoband yagi!
by windie licker II August 21, 2008
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