Rule of Thumb

The rule that basically a lot of modern women will allow a man to sneak a finger up their ass during sex, but will draw the line at full anal sex. The rule of thumb states that a thumb, being thicker than the average finger, inserted into a female's ass consensually will ultimately then mean that the consenting female will allow said male to insert his penis into her ass.

Davy and Stuart were together last night, do you know what happened? No, but apparently she failed the rule of thumb.

Davy said he's meeting Stuart tonight and won't try anything until he's found out whether Stuart passes the rule of thumb.

by PhilMujar June 02, 2014

thumb-wrestling

a perfect code word for "sex"

Me and Kelsey were thumb-wrestling last night, but then my parents came home and we had to stop.

by Purple Snail April 21, 2008

brown thumb

A person who enjoys sticking their thumb in peoples bum and sometimes the brown thumbs own bum.

Don't shake hands with a Jackie they're brown thumbs.

by one thumbs up August 21, 2010

Green thumb

When filling the paranphilla you smoke marijuana with your hands if you smell your thumb there is a distinctive odor of marijuana

Jif pack me another one (Jif) I can't i dont want to get in trouble for having Green thumb

by Ajif June 22, 2007

Black Thumb

A term for the inevitable black thumb received from pushing the ash down in a pipe

"My wife knows I started smoking again because of my black thumb, I always forget to wash it off!"

by InsaneJoker March 23, 2015

rule of thumb

A rule from the old days, in which a man could beat a woman with something no bigger than his thumb. It is now used in common language, and most people don't even realise the origin.

According to rule of thumb, you must be this tall...

by Spiff C May 29, 2006

thumb down

1. Verb - to make someone feel sad by dissing their urban dictionarydefinitions anonymously, from a safe distance away with no come back.
2. Noun: a sad, loser, nerdy type who even his own Mum struggles to love.

Mum: You look a bit glum today, petal.
Geeky Kid: Yeah - I added 17 definitions to urban dicitionary dot com and some yorick went and thumb down every one.
Mum: Sometimes I just don't understand what you're saying.
Geeky Kid: (stressing, stomping out of room) See - even you got me as a thumb down!

by chris firth September 21, 2006