From the Origin:
1635–45; < It trillo quaver or warble in singing ≪
Gmc; cf. D give trillen to vibrate, late ME trillen to shake or rock (something)
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verb (used with object)

1. to sing or play with a vibratory or quavering effect.

2. Phonetics. to produce (a sound) with a trill.

3. (of birds, insects, etc.) to sing or utter in a succession of rapidly alternating sounds.

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verb (used without object)

4. to resound vibrantly, or with a rapid succession of sounds, as the voice, song, or laughter.

5. to utter or make a sound or succession of sounds resembling such singing, as a bird, frog, grasshopper, or person laughing.

6. to execute a shake or trill with the voice or on a musical instrument.

7. Phonetics. to execute a trill, esp. with the tongue, as while singing, talking, or whistling.

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noun

8. the act or sound of trilling.

9. Music. a rapid alternation of two adjacent tones; a shake.

10. a similar sound, or succession of sounds, uttered or made by a bird, an insect, a person laughing, etc.

11. Phonetics.
a. a sequence of repetitive, rapid, vibratory movements produced in any free articulator or membrane by a rush of air expelled from the lungs and often causing a corresponding sequence of contacts between the vibrating articulator and another organ or surface.

b. a speech sound produced by such a trill.
’if we can discover the meaning in the trilling of a frog,
perhaps we may understand why it is for us not merely noise but a song of poetry and emotion.’

adrian forsyth
by citypix November 11, 2009

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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 16, 2012

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Equal to the meanings of radical, gnarly, grand, or cool.
DANG, that Jared Paul is preeeetttyyy trill, if i do say so myself.
by gencap March 08, 2007

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one who shits in trash cans one who pantie raids locker rooms one who gets fucked by keough one who jacks off over kid anime porn in front of his father and one who smells like big foots dick!
big foots asshole smells like "trill".
by mathew siler November 23, 2009

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To be both terrific and Ill.
Bitches say I'm Trillllllllll
by Funds August 13, 2008

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When a person, place or thing is a mix between tight and real. A description word that describes something that you like.
Friend 1: "Yo man, I watched LeBron James score 40 points last night.

Friend 2: "He's trill."
by Melvin Sneed January 18, 2008

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Having, or experiencing the euphoric feeling of, sex with the sky/universe. Feeling totally connected to everything; Basically awesomeness captured and bottled with all things cool and then released into your bloodstream.
We're just straight up trillin on blunt rock.
by Trillen McTriller December 26, 2007

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Acid tabs.
I got trills.
by CadetMKultra February 11, 2004

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