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A term describing a person who is tripping shit after swimming whilst high on marijuana. This term is also used when a drowned man is found on a beach with marijuana in his pocket.
Example A
Lifeguard A: "oh shit, we got some sea weed in the water."
Lifeguard B: "Damn, those pot heads always come here trippin' shit and make people stop coming to the beach
Lifeguard A: "Yeah, we better go get that guy out of there, he might drown."
Lifeguard B: "Well we might as well watch him go for a bit, it might get funny."
Lifeguard A: "Yeah that is a good idea."

Example B
Rasta A: "Ja mon, i just dun found some Mary Jane In some drowned man's pocket."
Rasta B: "Holy Ganja, come here right quick and we smoke dat stuff off."
Rasta A: "Nah mon, this be my first sea weed i ever done found. I be saving dis stuff for da Jamaican forest fire that be happening soon."
Rasta B: "Ja mon that be a good idea, sea weed be some lucky stuff. I one time found some of dat shit and i won three ounces of Mary Jane."
Rasta A: Well mon, i tink u should come here right quick and do some smokin wit me. I save half for da Jamaican Forest Fire."
Sea Weed by DA RASTA MON February 29, 2012
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Sea weed in the ocean

A term used to describe the hair on your ass after a long, sweaty and usually hot day.
Matt: Hey Reed what did you do yesterday, it was almost 100 degrees out side?

Reed: I worked on my car all day, when i was done my ass felt like sea weed in the ocean!

Swimming in Sea Weed 

When the cops showed up, we knew we were swimming in sea weed.
Swimming in Sea Weed by rm105scott February 5, 2010

Seaweeding 

Describes the cute, seaweed-like way BTS sway when sitting in interviews, particularly when not talking. First noticed by @joonstaetae on Twitter
Lol did you see how much BTS were seaweeding in the Billboard interview
Seaweeding by Lydia130613 December 14, 2020

Seaweed Brain

A special title, and there are two most important uses of the title:

1. If your girlfriend is calling you this, smile or laugh and call her Wise Girl. She would love it, and love you more.

2. If anyone else calls you that, feel free to call him/ her any names you want, though it's best to call them "Pinecone face".
Gf: "Hey Seaweed Brain!"
Me: *smiles* "Hey Wise Girl!"

Random Guy: "Yo Seaweed Brain!"
Me: "Don't ever, EVER, call me that again, Pinecone Face!"
50% sea
50% weed
Guy 1: what is seaweed made of?

Guy 2: Sea and weed........ Don't you watch spongebob dude.
Seaweed by Synabam2.0.o July 28, 2009

underwater seaweed 

Pubes growing inside the vagina
Damn! Cassidy has insane underwater seaweed!
underwater seaweed by Clouds_4_lyfe February 14, 2018