When you are at work in your office looking up porn on the computer while stroking your cock under the desk.
You suddenly realise you are going to cum and don't want to cum over your hand or your trousers / shirt, so you quickly pull your handkerchief out of your jacket pocket or trouser pocket, and place it over your cock - like a tent. the handkerchief (hanky) will soak up your load, thus avoiding having embarrasing stained clothes.
"I was looking up fat cum bitches at worktoday, and had to cum a hanky - you wanna see it"?
Woman (unfolding her hanky onto mans stomach while masturbating him)
"Are you going to cum on my hanky baby?"
Man "Yes..... Ahhh Ahhhhh Ahhhhhchooooo...." (man ejaculates all over womans hanky)
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.