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Meaning a period of time in the past thought to be peaceful and pleasant
Halcyon by Girei August 10, 2018
totally calm and especially chill; not causing harm to anyone; very peaceful
I don't believe he started the fight, that dude is so halcyonic.
halcyonic by Hal Cyonic March 15, 2015

Halcyon Days 

Almost literally means the "calm before the storm", but can also be used to signify joy, tranquility, etc.
Halcyon Days by Kaba April 17, 2008
a person of unreputable background
that michael is a real hallion.
hallion by aj March 3, 2005
noun Hallion:

1. A messer, a brat, a naughty child.

2. A lady of very little ladylike features, i.e. a Slapper
1. That wee son of yours is a hallion if he was mine i'd wring his neck.

2. Darlin, ur the biggest hallion I know, I'm lovin ur work.
Hallion by Mattfink October 9, 2006
An all around great person who is always willing to listen and checks in on you. They're an amazing person and be happy if you have them as a friend. Their name shows their uniqueness and individuality. As well as their peacefulness that they hold.
Damn hanging out with Halcyon was so nice. I gotta hangout with them more.
Halcyon by hollow_gravity♡ June 29, 2021