Ghilly Suit

A malicious sexual action, performed during outdoor sex sessions with a female. Hit her doggy style, and upon reaching ejaculation remove your penis and skeet onto her exposed back. Simulataneously pull up two large handfuls of grass and dirt and toss that onto the semen, thus coating her in makeshift camoflauge.

This was often utilized by german snipers during world war 2 so they could both rape and snipe from concealment.

A real life garment used by the military, a poncho like material is attached with fresh leafs and woodland materials so the user can blend in with the given enviroment. A suit donned by Snipers, typically SAS and such.
The Ghillie has also featured in FPS video games, COD4, CODWAW, this gives the user(a sniper can only use them) a tactical advantage when it comes to grassy areas, but the developers pulled them off poorly and they rarely work.

the bush that just shot you

a camoflage suit, popular with snipers in any terrain, to pick of enemy without being spotted, appeared in the game ghost recon (though to not much effect), its especially usfull to pick of the nasty Arabs and Iraqi's, It was also used by gamekeepers to keep a look out for poachers

For one to creep on people(Guys/Girls) without being seen while in public.

Ghillie suit is a gear that allows you to blend with the environment. It is commonly used for hunting, paintball, bird watching and wildlife photography.
Ghillie suit is your best chance of getting invisible in any terrain. The trick would be matching your ghillie suit with the terrain you will be in.

a shaggy camouflage coverall or clothing outfit used to disguise yourself in leaves and vegetation. The ghillie suit was originally developed by Scottish game wardens to better count game and catch poachers.
Ghillie suits can be constructed in many different ways. Some services make them of rough burlap flaps attached to a net poncho. US Army Ghillie suits are often built using a pilot's flightsuit, battle dress uniform (BDU), or some other one-piece coverall as the base. Thread is used to sew fishnet to the fabric. A drop of Shoe Goo is applied to each knot for strength. Then the desired jute is tied to the netting.