Grumbleweed 

The various nefarious adult publications found ripped up underneath bushes/hedges at bus stops and public conveniences etc. (Pregnant Asian Babes, Razzle, Hairy & German)

Named after the hugely popular 5 piece comedy showband of the 1960's onwards.

'I alighted the bus to discover a small pile of disgarded grumbleweed on the roadside. Not only had the vibration of the bus journey aroused me, It now seemed that the aforementioned publication had provoked a small droplet of sperm to emit from my bell end'.

Grumbleweed by Phillip Cluskey June 10, 2005

Rumbleweed 

A "Rumbleweed" is what martial artists, particularly Brazilian Jiu-jitsu practitioners will recognize as a random hairball that goes rolling-by, like a tumbleweed, during training. The "Rumbleweed," is the accumulation of everyone's hair, from grappling "rumbling." And, somehow, it always ends-up in a ball, rolling around the mats.

"I don't think Professor swept the mats. That's the third "Rumbleweed," I've seen today!" "Hey, there goes a "Rumbleweed!"

Rumbleweed by Valhalla MMA May 3, 2019

Grundleweed

A tumbling mass of pubic hair that accumulates in a heavily used and rarely cleaned bathroom. The grundleweed may then journey to other areas of the house by catching drafts of air and rolling along the ground.

My girlfriend and I were about to get it on when a massive grundleweed rolled into the room and ruined the moment.

Grundleweed by Demme October 20, 2007

Grumblebee 

A normal bumblebee that is always grumpy

wow man, did you see the grumblebee by that flower?

Grumblebee by kfjkid April 23, 2011

grumbledeen 

a person who is particularly cantankerous or churlish in the mornings, but not all the time.

Well, I'm glad you had a good day at work, you were quite a grumbledeen earlier.

grumbledeen by heartfuldodger August 6, 2016