The "Ghost Dick" phenomena occurs after a night of especially vigorous sex. It is the feeling of the penis still being inside the female.
Ghost Dicked - past tense

the feeling one has after having sex when it still kinda feels like there's something up there

When you have intercourse with a female and she claims no such event occurred.

Ghost dick is when randomly choke or cough by unexpected random things. Take a drink of a beverage and it goes down the wrong pipe and you choke from it. Breathing in air at a certain point and it makes you cough really hard. Chewing a piece of food and a tiny part tickles your throat and makes you cough really hard! Laughing so hard you randomly start coughing really hard.

A prank where one knocks on a person's window late at night, and when said person goes to the window to check out the noise he/she is confronted with the prankster's exposed penis.

When you just sucked your mans dick and he came in your mouth. Then you share a drink or share a friends fork/spoon

when a guys bangs a girl and eventually leaves before anybody finds out, or even before the girl he banged wakes up in her room... like it never happened.