Term used by amateur flight "simmers" who typically watch certain disgraceful Youtubers. It is used to describe unrealistically smooth aircraft landings in a flight simulator or even real life, typically under a descent rate of 75 feet per minute. People who use this term are often frowned upon due to the fact that "butter" is usually used as a way to flex or appear as a tryhard.
Look at that butter! The aircraft landed so smoothly!
Did you see that Airbus A330 butter? I bet the passengers never knew when they actually landed.
OMG that was such a smooth butter!
Did you see that Airbus A330 butter? I bet the passengers never knew when they actually landed.
OMG that was such a smooth butter!
by Crazed_Pilot January 15, 2021
Get the Buttermug. I asked my husband if I could put his peanut butter banana in my mouth after he got done hitting me from the back
by Fat Boy Marco March 1, 2022
Get the Peanut Butter Bananamug. 
When a guy a from-unda-cheese, and a female is performing oral sex on him in the hot sun, butter steam is the smell of that special moment.
by like it or suck it May 15, 2018
Get the butter steammug. A person who regularly pursues and engages in sexual activity with butter. faces and is a player about it.
e.g. "Ken was the biggest butter juggler in town, always bragging about his exploits and showing off body-only snaps"
by Dangles December 6, 2018
Get the Butter Jugglermug. 
by Wazowski28 January 23, 2018
Get the butter nashmug.