redneck/trucker slang for drive like ya stole it!
c'mon man, I gotta date tonight, quit piddlin' around...hammer down!
its 6:55 and the derby starts at 7...hammer down or we'll miss the first heat.
I just shaved and hour off of that 3 hour trip - I had the hammer down.
If yer gonna catch her before she leaves you better put the hammer down.
guy 1 - "kick this mule!"
guy 2 - "simmer man! I got the hammer down! Wer only doin a buck 10 (110mph)"