While having intercourse in a bathroom, you do a girl from behind and give her a swirly at the same time while making horse noises.
I just pulled The Seahorse on Becky in the bar last night
by Aeden Kirin October 15, 2014
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derogatory term for Swedish men because they are given maternity leave when their wife is going to have a baby, so they also stay home to take care of the newborn (like male seahorses that take care of baby seahorses).
That (man's name) is such a fucking seahorse, slacking off from work cause his wife popped out another kid...
by chandeliertree November 21, 2009
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when you are drunk and fucking a girl, you pee inside her
Bob hooked up with Jane and gave her the seahorse.
by Blue April 6, 2005
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When a male ejaculates into a females mouth, in which she returns by spitting it into the males anus. Just like a male seahorse carries the offspring.
Ryan received a seahorse from some chick in a chevy truck.
by Papa-Juarez December 26, 2017
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A sexual position, where the female gets penetrated while being on top of the male.

Otherwise known as 'woman on top'
"What is your favourite sexual position?"

"Oooh...definitely seahorse"
by orpyhjrg March 18, 2008
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When a guy/girl is bent over their phone, while in stature that resembles the appearance of a sea horse (and usually on social media).
That guy has been seahorsing on his phone for an hour.

That girl looks like a seahorse when she surfs Facebook on her phone.

You seahorsed a lot last night while you were drunk.
by WestAndLondon January 21, 2018
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when there are a couple of sluts and then you look a little later and they multiplied like the asexual reproduction of a seahorse
Jim said he went bowling and saw these two girls, then looked 10 minutes later and ther were 15 girls, they reproduced like a seahorse!!
by joshdoubleu November 14, 2008
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