A common nickname for Detroit Diesel 12 cylinder diesel engines.
My uncles 1980 Peterbilt 359 truck has a 12 cylinder Detroit Diesel 12-V-71 engine, this truck can be heard before being seen while drivin down the road. Due to the engine sound and the engine being a 12 cylinder, that's how a 12 cylinder Detroit Diesel got the nickname Buzzin Dozen.
1. to get out of a serious situation. 2. to have a good time.
"dude, dude, just play and buzzin."