To travel at a speed exceeding 100mph and/or well above normal limits. A buck is 100 cents (or $1.00), hence for 100mph being a buck being the origin of this term.
That car was bucking it down the highway. The woman with the green shorts was bucking it past the other runners. That boat was inappropriately bucking it in a no-wake zone.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
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.