One who enjoys partaking in foot related activities. These activities more often than not include using stinky feet to cum, ejaculate, get off, splooge, jizz, bust, explode, skeet, seed, blow or if you feel so inclined gnarg or qwert.
Sam: Hey Tom this hot girl just got on the train and shes sitting across from me
Tom: Quick get a Stalkie
Sam: Got it, hang on a sec ill send it to you
Sam gets toms Stalkie
Sam: Nice man, shes a hottie, you should go speak to her
(Phrase) When a pothead has more than one joint and they are about to go smoke it with their friends, they'll use this term to describe the contents of their jacket pocket.