Snail tracks refers to the natural lubrication of the vagina when a woman is excited. A snail leaves a slime track, and this is attributed to a woman who is horny and sitting down.
When performing a lap dance, strippers will rubb there clitoris on the customer's pants. During this process the stripper will become aroused and her natural sex lubricants will seep out of her vagina onto the recipiant of the lap dance.
After a couple of minutes the natural vaginal lubricant that seeped out onto the customers pants will dry and get crusty thus leaving a "snail track" down the patron's pants.
DoocheBag 1: Where is the nearest dry cleaners?
DoocheBag 2: What for?
DoocheBag 1: I got a lap dance last night and that hornyskank left snail tracks on my best pants.
DoocheBag 2: sweet! huh huh, huh huh
Simon: why the fuck do you have your hand down your pants?
Esben: I saw a magnificent porn movie just before you came over, I didn't get to whipe my dick that well, so now my underpants are loaded with snail tracks!
After a man blows a fat load up in a woman's vagina, if it drips out and she smears her puss, over the sheets it is said that she has made snail tracks.
"She can leave snail tracks as long as she washes the sheets and I don't have to sleep on the wet spot."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.