That sense when you're driving an automobile other than your own (and enjoying it) that you are cheating on your car. This feeling of guilt and cheating intensifies exponentially when contemplating/financing/purchasing a new vehicle and reaches it height as you see your trade-in getting smaller in the new car's rearview mirror.
Dude 1: "Dude! You got that new Jeep! Niiiiiiicce!!!"
Dude 2: "Oh man... I love this car but I feel like SUCH an autulteror."
OR
Woman parks new car all the while avoiding looking directly at old car parked in driveway which she has not driven in awhile (and frankly hasn't missed). She pats it on the hood with a grimace and mumbled apology because she feels like she's committing autultery with the new, nicer car.
Some consider adultery as a potentially dishonest sexual act, and use verbs such as commit. ie She committed adultery. Some consider adultery in the same sense as a greeting or a handshake, and simply behaving like an adult. Hence the word ADULTery.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
A phenomenon in film/television series, most notably streaming series, where the main premise is drawn out to such a point that it takes an entire season or more to get the parts of the series the audience is actually interested in seeing.
For example, if a series is titled "Surf Dracula," a majority of viewers would tune in expecting to see Dracula surfing by the first or second episode. However, the entire first season would instead be tedious padding and backstory before finally ending with Dracula surfing in the last five minutes of the season finale.
I watched "Smallville" on Netflix the other day. Dude, it was ten seasons of filler before he finally flew! Major Surf Dracula Syndrome!