The moist secretions left by female anatomy after it has been heavily aroused or after having been filled with ejaculate.
Typically a slugtrail is created by a woman after pulling off her man after a good ride
. The female typically rests her pudenda upon the man's belly, slides back and forth, and create a slugtrail.
Also used to refer to any wetness created after said ride
on the sheets.
It can also be used as a gerund (slugtrailing). Typically used by skanky girls to refer to one anothers' feelings about an attractive male. See second example.
Bitch was so wet that when she pulled off she left a slugtrail all the way back to her side of the bed
Yo, bitch stop slugtrailing after my man - ya stank ho!