Sustainable 

Repeatable indefinitely with no negative side effect whatsoever.

I think this new training schedule could be sustainable

Sustainable by Xeidor August 27, 2023

Sustainable 

putting a warm beer in the fridge every time you take a cold one out

recycling the beer can is sustainable too

Sustainable by sonofabun August 31, 2015

sustainable 

adj. Concerned with trendy, liberal, or faddish causes, especially alarmist environmentalism and anti-capitalism. An activity or product is described as sustainable if it promotes a hippy agenda, regardless of whether the activity in question has any particular ability to be sustained over a long time period or not.

Fair trade coffee is a sustainable brand.

sustainable by Zamzara October 24, 2007

Sustainable drinking 

Drinking now without affecting your ability to drink later on in the night

Mate it's early, let's get a bit of sustainable drinking on the go and fire into a couple of poof juices so we last the night

Sustainable drinking by getitrightroundye April 3, 2009

Sustainable Aviation Fuel 

(Acronym: SAF) A term used to describe an aviation jet turbine fuel that meets the criteria of the Sustainable Aviation Fuel Users Group (SAFUG) and/or the Roundtable on Sustainable Biofuels. It is typically created from second generation biofuel feedstocks, such as algae.

"Sustainable Aviation Fuel is going to revolutionise the airline industry"
or
"SAF is a good investment"

Sustainable Aviation Fuel by dictionaryonline789 January 7, 2010

sustainable dolphin 

when you constantly have oral sex.

wow, me and mike, were having a sustainable dolphin!

sustainable dolphin by cowandmoo October 18, 2011

Sustainable Architecture 

A supreme form of architecture that the Internet needs to fucking talk about, involving buildings being littered with an earth shattering amount of plants.

Josh’s best friend just hit on his girl, so he decided to calm down by looking at pictures of sustainable architecture.

Sustainable Architecture by stoleyourgirl June 15, 2023