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."
by Meus Nex October 24, 2008
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Another word for Chill, Gnarly. Which came from Surf Culture.
"Bro, I was gettin some trill waves today it was sweet."
by Uber Tasty July 17, 2012
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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""
by annoyed anonn May 14, 2013
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Tha werd trill iz a combination of tha werdz Tru N Real.
amma b trill 4 life!! simple az dat
by Omar February 18, 2005
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A species from Star Trek: Deep Space Nine.
(There is one episode of ST:TNG where there's a Trill too.. heh)
by NobleArc February 25, 2004
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someone who's keeps it "real" they dont cross niggaz,they play tha game... thats whats it means to "keep it trill"

signed ThaCrip
by Anonymous January 30, 2003
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Somone who lies constantly for the thrill off being a fat cunt but dw he loves kids so he is not that bad even if he is 40
by Mr won ton March 6, 2021
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