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The accumulation of rogue hairs from a woman's head on a man's genitals after sex; similar to the gathering of free floating seaweed. Usually not noticed until the putting on of underwear or taking a shower.
1. "You know Susie is bulimic, right?"

"Well, that would explain all the sexweed."

2. "I can feel some sexweed tangled around my balls."

3. "I didn't realize how hard I was pulling her hair until the next morning when I found tons of sexweed."
Sexweed by Adenosine July 31, 2010
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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

Seaweed Stalker 

One who stalks seaweed...
While i was swimming i noticed there was a seaweed stalker in the water.
Seaweed Stalker by Michael Rosas September 26, 2010

sex-weed 

the general act of placing rose petals and your selection of bud in the bongwater.
Hey baby lets smoke this Sex-weed!
sex-weed by gongetcha April 15, 2010