The sadness one feels when a hookup with a new partner, is not going to happen, specifically in a wife swapping fantasy. For whatever reason, the hookup never happens, schedules, sickness, cold feet, shark week etc. When those reasons mix with higher than normal expectations, misperceptions of levels of experience, fear of safety etc. it causes a reluctance to act on the desire to hook up. It didn’t happen and now you are sad and wish it had all played out differently. The moment is gone and someone is relieved, someone is sad and the other doesn’t care.

Swap Drop is caused by a loss of perpetual state of desire and anticipation. It is replaced by an empty feeling that for some they can be can be replaced by another few quick swipes to the right. For others, it's a sign that it's time to buckle down and get back to the real world with very little time for fun and frivolity.
SWAP-DROP used in a sentence.

"I've got SWAP-DROP from not getting to hook up with that really cute guy. (Crystal Clear Blue Eyes)"

Pal 1: What’s wrong, where is the pep in your step? You’ve been in such a good mood lately!?!

Pal 2: Recent plans fell through and now I have a case of Swap-Drop

Pal 1: Oh that sucks, you were so excited and peppy.

Pal 2: I know it really sucks, he was super cute, a good guy who has the most beautiful Crystal Clear Blue Eyes I've ever seen. I think he over thought it and freaked out a little. I guess the moment passed. I wish him well though. Half the fun of seeking out this kind of fun in the first place is random fun texts from a cute dude, it's exciting and I’ll miss it.

Pal 1: Oh wow! I know how hard you work and how infrequently you get to let your hair down and relax, that must suck. Good thing you still get to fuck your hubby on the regular though.

Pal: 2 Yup there’s that, so not a total loss ;)~ Oh and I got a cool new playlist!
by Six Licks September 20, 2018
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Swingers. Married people that like to have sex with other couples.
The Butlers are swap masters with the Smiths.
by Amanda CB January 17, 2006
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It is a sexual act between two guys when one homie is sucking the other homie's dick, and then they swap where the guy that just received head is now sucking the other homie's balls.
Friend 1: "Bro you down for some Yankee Swap tonight?"
Friend 2: "Yea but only if I get to go first"
by lilnutzak69 January 26, 2021
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When you trade sexual partners.. as opposed to soft swap where you just watch, or be watched, the other couple having sex. Sometimes soft swap does entail the trading of oral sex between the different couples.
M and L are into Hard Swapping at their swing parties.
by surgiomx March 25, 2009
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a shock scat movie (50 minutes long) in which 4 brazilian sluts shit into each others anuses, shit back out the shit, eat the shit, vomit onto each other, vomit into their assholes, suck the vomit out of their assholes, etc. far worse than 2girls1cup OR 2girls1finger.
I just watched swap avi.
-how was it?
A million times worse than 2girls1cup.
-no way.
way.
by araknidude November 30, 2007
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Something exclusive to call of duty and gmod, where you press Y at a certain point in an animation and it changes weapon instantly, it can be done with many different things and requires very fast timing to get them consistently. Unless it is a Moni NAC.
"Wow, did you see that tag NAC swap prodan hit on derail in Despize cams 47?"
"Yeah that was ok but I am better"-Cedar
by NACCER March 3, 2015
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