The term used to describe the leftover urine which leaks out of the urethra and into your underwear after urinating.
Winter Dick is prone to cold weather (winter specifically), and may occur even after you 'shake' several times.
Winter Dick results in "pee spots" in your underwear and may also result in having a very moist penis. It may also risk your chances of receiving head.
"Hey, has anyone seen my pants?"
"...Dude, did you piss yourself?"
"Oh no...Its just Winter Dick! Son of a bitch! It always happens! No matter how many times I shake!"