A different creature from another planet like an alien usually named Aquene,Sato,Aeris, and Bailey!
Aquene and Sato are Extraterrestrial so are Aeris and Bailey
by Cupcake:3 November 27, 2013
The extraterrestrial is performed by deliberately (in some cases, nondeliberately) taking a shit on a toilet seat. This may be performed either as an act of revenge or a practical joke.
That asshole definitely stole my Kindergarden Cop dvd so I'm totally gonna perform the extraterrestrial in his bathroom.
by Dennis T. June 24, 2010
Next level. So mind-blowingly, extraordinarily out-of-this-world impressive that everything earthly is now mundane.
The Bugatti Chiron is flat out extraterrestrial.

Chad fucks like an extraterrestrial.

There had to be something extraterrestrial in those moonrocks.

nocap I was woke like an extraterrestrial after taking nzt48
by Airone April 26, 2019
The act of having sex with an alien species.
I just did an act in extraterrestrial breeding and now I have space aids
by Dubiks January 18, 2019
Extraterrestrialism is an ideology that supports that extraterrestrials are friends of humans and that humans should prepare themselves for be integrated to the other extraterrestrial species. Extraterrestrialism also supports massive research for extraterrestrials and the evolution into an extraterrestrial civilization as well, despite extraterrestrialism also supports that humans are also extraterrestrials and aliens somehow. Extraterrestrialism also believes that all extraterrestrial lifeforms are equal and that they should cooperate between each other.
"Extraterrestrialism is well known by support the integration of humanity into other extraterrestrial species and even the support that humans are extraterrestrials somehow."
by Full Monteirism June 28, 2021