Typically used as a joke, a dead soldier is a singleturd left in the toliet. To be properly considered a dead solier, the turd in question must be solitary, and this is especially crucial, left with no toliet paper in the bowl. The phantom shitter must leave it behind and seek a wipe elsewhere. The dead soldier is then left for the host to find at a later time.
Hey John, Dave called and said he found a dead soldier in his bathroom after the party last night.
When one's rightly limped penis is wrapped in latex material, and has just released man nectar. Usually before any kind of sexual intercourse. Thus looking like a suited up solider, dead in his own pile of fluids.
Dick: Heard that kid got the dead soldier with Gina.
Clark: Hahaha who the fuck gets a dead soldier when your about to stick it in a fish taco as fine as Gina's.