Explaining difficult stuff in an easy to understand manner
For example instead of:
"The geological force, resulted in extreme vibration of the terra surface."

Say it in Layman's Terms:
"There was an earthquake."
by GaryTheGoose April 4, 2020
To put something in layman's terms is to describe a complex or technical issue using words and terms that the average individual (someone without professional training in the subject area) can understand, so that they may comprehend the issue to some degree.
Instead of saying:

"You need a new piston, valve guides, stator, and counter-shaft balancer"

In layman's terms you'd say:

"There are some internal parts that need replaced"
by stealth17 October 10, 2006
Easily understandable; not in complicated technical jargon.
Javier: "What'd you do last night, dude? I didn't see you at Jose's big party. There were mad smokin' chicks there man."
Pedro: "Well, my amicable acquaintance, I engaged in an act of copulation with your maternal entity in which I inserted my genitalia into her rectal cavity. The aforementioned encounter was extremely pleasurable to both parties involved."
Javier: "What?"
Pedro: "In layman's terms, 'Dude,I banged your mom indabutt, and it was reeeeeal gooooood.'"
Javier: "WHAT THE FUCK? You're dead, essay!"
by Nick D October 27, 2004
Saying something technical/confusing in an easy to understand manner (like when someone says a confusing phrase, whilst the other is like "SPEAK ENGLISH!")
"Momentum, a function of mass and velocity, is conserved between portals. In layman's terms, 'Speedy thing goes in, speedy thing comes out'"
by Cakeisalie December 10, 2007
The use of basic speach, or words/terms that a person will understand.
Teacher: The volume of a container with a gas, when reduced by one half, will double the force exerted by the gas by a factor of two
Student: Uh, I don't understand. Can you give that in layman's terms?
Teacher: When you squeeze a balloon to half it's size, it is harder to squeeze right? This is because the pressure is doubled. Get it?
Student: Uh, Yah!
by Nate314 July 11, 2006
Something someone slightly slow, like Parker, would understand.
Laymans Terms: Parker has a lot of shit under her arm.
by Urban Dictionary (Admin) March 31, 2009