adj. gex·i·er, gex·i·est
* Arousing or tending to arouse sexual desire or interest through appreciation and understanding of technology or other matter-specific grok-itude, such as music, theatre, or art.
Bill Gates, in that 80's Teen Beat magazine is totally gexy, as was Anthony Michael Hall in 16 candles. Weird Science is another study in gexiness.
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.