A sexual maneuver performed after girl-on-top copulation. Girl begins by sliding forward off of man's member, continuing up the stomach, chest and ending by sliding off man's face, leaving behind a trail of shiny, sticky, gooey ooze comprised of vaginal juices, semen, and any additional lubrication products used.
Bill: Hey girl, why don't slide up here and leave me a slug trail?
Tonya: Sure, give me a sec to dismount. That lube we used will make it extra-sticky!
The residue left on bed linens after a man ejaculates, cleans up the bulk of the semen, and then sleeps naked, allowing the remaining liquid occupying the dead volume of his reproductive organs to leak out slowly. The man's flaccid penis is then remarkably analogous to a slug, leaving ooze trails as it squirms about.
WOMAN: "You were amazing. Come cuddle with me, stud."
MAN: "Just a second, let me put my boxers back on, I don't want to leave slug trails all over your Egyptian cotton sheets."
one day my husband told me while im sleeping that he was going to "cock slap" me, so in return i told him thats fine but you will wake up with a slug trail, im gonna put powder on my cooch and slid it across your face.
the white pastey substance from a vagina that is absolutly fucking revolting and tends to smell of belly button fuzz and bad slurpie; when whipped on something it tends to leave a trail like that of a garden slug on cement. When combined with Elmers Glue it turns into Elmers Mayo
adrian: isabelleyour so wet isabelle : i know
adrian: ahahaha
isabelle: ew! dont wipe that slug trail on my legs!