Like a catfishing, except the person is real but their intentions are to ruin you financially, emotionally, steal your identity or con you in some other way.

Back in the day, mermaids where thought to lead sailors to their doom by leading them to dangerous storms, crashing upon rocks, or dragging them down under the sea.
I finally got in the DMs with that hottie Mercedes, but all she wanted was for me to get her Snapchat premium.

She was mermaiding me this whole time.
by Savage Sage August 5, 2019
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A fandom in which a woman (or more rarely a man) either buys or makes a mermaid tail for the purpose of swimming in pools, lakes, or just posing on the rocks, usually while being photographed. Occasionally done with other mermaids.
Hannah got her new tail in last week and can't wait to go mermaiding in it.
by The Neo-Architect March 18, 2011
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Mermaiding is a common practice on Tinder, Plenty of Fish, etc. It involves women posting suggestive pics of themselves and claiming they are single and interested in dating YOU, and offering you an Instagram address to follow in order to contact them. Once you add their private account... you find out via all the pictures of her and her steroid user boyfriend(s) that in fact she just lured you onto the rocky shores to see your little life raft of hope and interest wrecked like so many many other sailors before you. "What just happened" you ask??? She got a new follower to keep funding her shenanigans, and you got another pie in the face that discourages you from dating anymore... and pushes you further towards John Galt'ing the thing all together.

Mermaids are a type of Siren.. if you dont know what a Siren is.. you need to brush up on Greek Mythology as it is VERY VERY applicable here. Go to Wikipedia and read up on Sirens..

There is a special place in hell.. near the betrayers, catfishers, lonley hearts scammers, Nigerian Scammers, and mutineers section, for Mermaids and Sirens as they prey on the hope and affection of others to make money to generally live a selfish and self absorbed lifestyle at the EXPENSE of you being their follower...

Michael Wilson coined this term as a gender opposite to "Catfishing" back in 2013 in an article about internet love scams for GAWKER, which was up and searchable until 2016.
Mermaiding: To create a fake profile on a dating site which you then use to falsely imply to men that you are interested in dating and talking to them via your Instagram account. Once they follow said private account, they find out you aren't single and have a man, but the scammer has gained another follower which they monetize to continue funding this ruse, at the victim/followers expense.

Friend: So what happened with that girl you were messaging on Tinder?
You: Ugh... once she accepted me on IG all of the pics of her and her boyfriend "magically" appeared..
Friend: So sorry Amigo.. you got MERMAIDED again
You: Yup.. but shes got like 120k followers and like 119k are men... so Im not the only one who got wrecked...
Friend: 119k guys inadverteheyntly paying her to do that S**T to their fellow men and live well doing it.. sad..
by WearySailor35 August 13, 2019
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To fuck someone with both feet, or to fist someone with both feet.
My feet are cramped from mermaiding your mom all afternoon.
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When you pay someone to have sex or physical emotions with you or someone else like prostitution
Mermaiding is defined as someone selling their self or prostituting that bitch was mermaiding last night
by Bestpandora7539 March 25, 2019
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Descriptor for behavior that involves long periods of bathing, absentmindedness, vanity, personal grooming, or any combination of these
I spent all Sunday afternoon in my bathroom. I was mermaiding; you know, not really doing much of anything but laying there and picking at my face in a handmirror.
by OneSpyke December 14, 2014
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A sexual act where a partner inserts a large fish into either the anus or vagina of their sexual partner. The fish must be inserted head first, with the tail protruding out between the legs.
“Oh man, turns out Stacey is totally into mermaiding. We had a wild one after that ‘all-you-can-eat’ seafood restaurant, we ended up taking a whole tuna home and she let me shove it up her ass”.
by BJ Pennywhacker August 31, 2018
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