a final orgasm (which may also be the first) occurring at the door after a date or booty call; replace the kiss in a "good night kiss" with an orgasm and it's a doorgasm
At the door, while saying good night, Mason fingered Amanda for a doorgasm.
A climax of excitement, often marked by jumping, panting, barking and/or drooling that dogs experience upon realizing that a person or group of people have entered the same building or room they occupy through a door.
A knock on the doorgasm is when you're jerking off and someone knocks on the door while you're at the point of orgasm, causing a very awkard situation in which you can't decide whether to answer the door or simply ejaculate.
"Yesterday my friendAlex had a knock on the doorgasm. He was in a very sticky situation ;)"