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When a person is getting head, and shoves his (or "her" if it is a transsexual) cock deep into someone's mouth, making the person choke and puke, but keeps his cock in place and holds the head-giver's mouth closed, forcing him/her to gag more on the cock/puke. The victim has received a gagnon!
Vincent didn't know what what hit him when the trannie hooker he hired got rough and gagnoned him. Needless to say, the tip doubled...
Gagnon by Al-el-mexicano November 4, 2008
A person who defines lilt and glib to ruin the English-American language for all who may possibly find joy in it.
If for once you didn't act so Gagnon, maybe their would be some sort of peace in this world for post-interns like myself.
Gagnon by Sensei Sarah November 6, 2006
Extremly ugly somewhat mythical little creature
Sometimes mistaken for a Leprechaun.

it's language only consists of the words Arr-Charr!!
Dirty little gagnon.............
gagnon by Robavenger June 29, 2006

Gagnon Stake 

A special stake made for holding yard signs for stand out events. The stake is characterized by a channel for the sign to sit in and two thin rods to insert into the sign to hold it
These Gagnon stakes work great for temporarily holding my sign for our event
Gagnon Stake by Jagerman July 8, 2021

The Gagnon UBI

A reference to the massive amount of donations sent by YouTube stream watcher Matt Gagnon, who is notorious for donating hundreds of dollars to streamers out of the blue.
I was struggling to get superchats, but Matt Gagnon dropped 500 dollars. The Gagnon UBI saved the day!

Raphael Gagnon 

A very emo guys, who prop plays hockey. Super Quebecois. his jersey is 44. Raging Capricorn ♑️.
Me:Oh have you seen the emo guy? What is name?
Homie: Prop Raphael Gagnon
Raphael Gagnon by Raph44 March 11, 2022