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Injecting large amounts of tadpoles up a mans ass until they explode out of his anus. Very similar to the way a male seahorse gives birth to its young.
"I asked him if he wanted to try seahorsing and he looked at me like I was some kind of freak!"
by fistymcbeefpunch January 17, 2014
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2
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 20, 2018
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