I do not know but it was priceless when originally mentioned. That term is compliments of Haroldo- he used it to describe the location of a dent in his C-14 fuel tank I believe (something like "left a small dent right next to the gashole" or similar). I about fell out of my chair when I read it the first time and pointed it out. It became sort of a forum linguistic cornerstone.
By the way, if I remember correctly, Haroldo had plugged a battery charger in above his bike, the charger fell out of the socket.... landed on the fuel tank..... and left a small dent, right next to the gashole. Haroldo took a photo, posted it on the forum and asked if we thought the dent was noticeable.... to which most of us responded that it was bigger than Lake Superior, if it filled with water it would knock the bike over, etc., etc. Ah, good times. By the way, the dent was not really big enough to hold a mosquito.
Brian
"Gashole", am I the only one that can't say that without laughing...