The "tadpole" like shrapnel emptied into the toilet bowl from your bowels after eating salad the day before or that day and it requires lbs of toilet paper to cleanse, it's almost like wiping your ass with wax paper.
As he gazed into the starry night and gave a final squeeze and tug to his blood-engorged cock, long streams of spooge squirted skyward. He felt as though he were shooting tadpoles at the moon.
milly: i was wanking ferociously to a picture of biggles naked because i needed to set the tadpoles free.
Adam: yeah you will get blue balls if you let your spooge build up too much paul.
tadpoles resemble sperm under a microscope which is why this saying is used