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. 
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. 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. 
A person, generally upper middle class, who claims to be progressive and/or leftist, but it extremely centrist and cares little for the struggles of marginalized groups (unless directly affected). Cookie Butter Democrats embrace neoliberal values and believe that capitalism can be ethical. The term comes from the phrase "Democrats don't really care about native sovereignty and will not until affects the supply of cookie butter at Trader Joe's"
by feeshna January 26, 2017
Get the Cookie Butter Democratmug. by shadzG2K January 13, 2015
Get the Buttersmug.