The other definition is false. On the dash does refer to the dashboard of a car, specifically the gauge panel. The number refers to the highest speed on the speedometer.
The Boss - Rick Ross
I've got a Chevy with a 454 in the hood and it's got 125 on the dash.
(Most classic muscle cars displayed a top speed of 125 on the speedometer.)
T.I. - Big Things Poppin'
Think I won’t pull up in something with 200 on the dash.
(High-end supercars, particularly of Italian origin, commonly have the top speed of 200 on the speedometer.)
refers to the dashboard of a car; an associated number indicates the total amount paid for a vehicle including any modifications made (e.g. the price of the car, rims, stereo, engine upgrade, etc.)
think i wont pull up in somethin' with 200 on the dash....
i've got 125 on the dash...
both instances used so as to say, my car is worth, for example, $200,000 or $125,000 respectively
A phrase used to describe an insanely hot person. Etymological history comes from the following exchange: If a person is incredibly good looking, they are "mind boggling". If the person is "mind boggling", then by seeing her your "head is boggled". If your "head is boggled", then you are essentially a "bobble head". If you are a "bobble head", the person of affection can then "put you on her dash" for decoration.
Person 1: Dude, did you see that girl?
Person 2: Yeah she was so hot!
Person 1: No doubt! She put me on her dash...