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1.
residue left on the bed sheets from the male genetalia immediately following vaginal intercourse. Thus leaving detectible "trails".
I know you had sex on my bed because you left cock trails all over the sheets.
by ammilent March 31, 2007
 
2.
That spotted line of semen (cum) you leave on, but is not limited to your boxers, pants, sheets or any other garment or piece of fabric you own.

Other possibilities inclube shirts, panties, dresses, or assorted garments.
Captain Kirk: Dude, I left such a mad cocktrail on Uhura's uniform last night.

Spock: Sick, Jim.
by Kidbash November 29, 2009