The act of scrubbing your pubic hair (may also include gooch and/or asshole hair) and area around your genitals more vigorously in the shower than you otherwise would, in anticipation for intercourse. This is done in a meticulous manner in order to rid the area of unpleasant odors or residue (ball sweat, asshole lint, swamp ass, gooch grime, anomalies in pubes etc.)
"Jenny's coming over later, I better scrub the shrubs extra hard today"
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.