Spontaneous Erection - when a male's penis becomes erect for no *conscious* reason; or for an obvious reason(presence of a beautiful woman) but without the male intending it to happen.
I was sitting at my desk reading an email when I suddenly noticed I had a sponto! Had to tuck it into the side of my jeans and sit with my crotch fully under the desk!
I was on the date with Jane when I suddenly felt a sponto come on - I had to take my time with my coffee until it was gone before I could go get the bill!
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