The lengthwise measure of one's scrotum, generally from the base of the penis to the start of the taint.
"Whoa dude, check out the scrotal span on that guy! I wish my balls were that huge."
-or-
"Haha, look at ol' tiny-balls over there. I bet you can't even measure his scrotal span with a microscope!"
-or-
"Haha, look at ol' tiny-balls over there. I bet you can't even measure his scrotal span with a microscope!"
by Penis Inspektor February 12, 2008