When a woman where's no underwear. Referring to the silver "snail trail" she will leave on places she sits.
"The boys are in for a treat tonight, I'm snail trailing!"
by DJ-Chuckles November 06, 2009
Having some semen on the tip of your penis and dragging it across an individual's face in a trail like matter.
We went snail trailing at my big brothers sleepover.
by Snail Trailer November 28, 2011