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1.
Little spots of dried cum marking where one has either jacked off or had sex.
Rob left peter tracks on my sofa after watching The Dirty Dozen IV.

Ben has peter tracks on his underwear from all of his wet dreams.
by TexAMAggie05 August 02, 2005
 
2.
A urine spot on levis after a quick piss
Gee..... i walked to the bushes and pissed quickly, but forgot to shake it,and it left a sizable wet spot ,and the girls noticed...my peter track.
by pseudomun August 21, 2009