i'd guess boner, and then the scientific term was created
but i'm sure the first person looked down and was like "lol boner" not "well good sire it appears as though my genital region, especially the shaft of my penis, has been stricken with an excess of blood causing an erection due to my sexual excitement over seeing ms. perrymuggins wink at me from below her flower adorned hat"
how did you find that did you look up "boner" on google images or something? gross man, just gross. unless you're into that kinda stuff then i understand i just don't go that way. i respect you for coming out to people, it must've taken a lot of courage. but maybe you didn't do any of that who am i to say.
I was sad, I stopped being sad, and then I was awesome