trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.

I had a trucker's tan after driving for 10 straight hours on a sunny day.

trucker's tan by population361 May 30, 2006

Trucker's tan 

Trucker's (trucker's) tan is far more commonly used than "trucker's arm". It's used when recognizing that a person's left arm (driver's side arm) is tanner/redder than his right arm.

It's used in the same way a person would be said to have a "farmer's tan" if both his forearms were tan/red up to the point where his (short) shirt-sleeves end on the upper part of the arms.

With the ubiquity of air conditioning in cars today, "trucker's tans" are seen much less frequently. But if noticing a person's left arm is red/tan (but not the right), say, "Hey Joe, you been driving a truck? You got a 'trucker's tan', my friend!"

In the same way, upon noticing the whiteness of a friend's upper arms in contrast to their forearms, you might say, "Hey Joe! You been out farming today? You got a 'farmer's tan', my friend!"

Trucker's tan by Who is they? May 28, 2014

Trucker's tan 

Where a driver has more of a tan on their forearm, according to which arm they put out the window of the vehicle they drive in, which receives more sun than the other one that is inside the car. It was originated from the truck driver as they drive long roads and long hours.

Johnno: I've got a big trucker's tan on my right arm.

Jenny: I saw, it looks odd.

Trucker's tan by nunChaKu May 25, 2007

Truckers Tan 

When the fist and forearm is inserted into a bum and the arm is then a darker colour due to poo particles.

Hey dude, why is one arm darker than the other"....."because i did the truckers tanarm on my girlfriend last night"

Truckers Tan by milero91 July 6, 2011