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(Noun) A noise a xeno/alien emits when expressing joy, pleasure, excitement, satisfaction, or other positive emotions.
(Verb) A declaration of sexual interest towards xenos/aliens. Can be compared to "yiff" towards furries.
(Noun) "The alien let out a trill when found a lone cow in the pasture to abduct."
(Verb) "The alien was not prepared for the farmer's trill intentions, who had just been abducted while wearing a cow costume."
Trill by Mietere December 20, 2022
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A fictional culture in Star Trek. True Trills consist of a humanoid host and a worm-like symbiote that lives inside the abdominal cavity. There are at least two traditional host species; other races such as Humans can only serve as a temporary hosts with medical assistance.

The host has the benefit of the symbiote's lifetime of wisdom and experiences through several previous hosts. Each symbiote has its own name, which becomes part of the host's identity. Joined trills have unique personalities blended from both beings.
Star Trek DS9 had two Trills among the main characters. Both Ezri and Jadzia were joined to Dax.
Trill by gooberliberation December 28, 2005
Related Words
Someone who seems to have multiple personalities, or is two-faced.

Derived from the Trill species in the fictional Star Trek universe, in which a host's personality changes when merged with a symbiont.
"Dude, she was all over you last night, now she's being a major bitch. What's the deal?"
"She's fucking trill."
Trill by Meus Nex December 9, 2008
Another word for Chill, Gnarly. Which came from Surf Culture.
"Bro, I was gettin some trill waves today it was sweet."
Trill by Uber Tasty July 19, 2012
A word used by idiotic and stupid people who cannot grasp the English language and try to be 'cool'
"That's so Trill"
"Shut the fuck up and learn some proper words you utter twat""
Trill by annoyed anonn May 14, 2013
Tha werd trill iz a combination of tha werdz Tru N Real.
amma b trill 4 life!! simple az dat
Trill by Omar February 18, 2005
true + real = trill
1 + 1 = 2
2 + 2 = 2
true + real = trill
trill by KyleVA October 3, 2008