A particular type of obnoxious person one encounters in extremely large groups, or where everybody is universally included. Because there are so many people, there is a significantly higher probability of idiotic people.
Facebook comment sections are terrible. It's just giving voice to the lowest common denominator.
by ButIDontLikeCheeseIts December 13, 2015
1. The number underneath in a fraction after simplification

2. A dumbass or a group of dumbasses
1. "I got half marks in that maths test because I didn't simplify to the lowest common denominator"

2. "I got into a fight with a group of the lowest common denominator, mate"
by psychedelic_fuzz May 30, 2007
In relation to people, they are the simplest group in a population. They have the simplest opinions, the simplest views and the simplest lifestyles. They are the unsophisticated (which is not correlated to the amount of happiness they have - in fact, living a simple life may make you even more happy than living a sophisticated one). Because these people do not think as much as a sophisticated person, they tend to be more naive and more gullible to gut feelings, and the ingrained culture and social laws that are around them. Their trust is easily earned.

In terms of politics, this can be taken advantage of when politicians use their persona and the gut feelings of their audience to gain followers, even when their policies and views might be to their disadvantage.
Those GOP candidates like to target the lowest common denominators in each state because it's easy followers for them. I mean, who would follow Rick Santorum because of a sweater vest?
by Bluestjay February 22, 2012
Phrase meaning base or crass. Used to describe ideas associated with sex or innuendo. Similar to the phrase "his mind is in the gutter."
"It's embarrassing inviting Dave to my parents' house; he always takes the conversation to the lowest common denominator."
by Shumado January 16, 2012
1. When someone claims to be "Christrian" but has never been in a church and has a vague recollection of the ten commandments, but thinks they are good person.

2. In religion, the lowest common denominator or least common denominator (abbreviated LCD) is the least common multiple of the denomination of a set of vulgar religions. It is the smallest common thought that is a multiple of the denominations.
God hates fags, that's Joseph 3:16, bro... I know I am apart of the lowest common denomination.
by floorfly November 13, 2010
The Society of The Lowest Common Denominator is a term I invented for the end result of Socialism and Politically Correct Pseudo Interllectual Fascism. It describes a society where everyone is condemed to the level of the slowest, weakest, most interlectually inadiquate and emotionally crippled.
You can't give an honest opinion on fedd back forms in case someone is offended? Talk about the society of the lowest common denominator!
by Rikstir October 28, 2013