The act of kissing someone before he/she leaves . Instead of actually saying goodbye, you say it by kissing. Sometimes can be done on your partner before leaving the house to go to work. Sometimes can be done to end a relationship . You end things with your once significant other because you can no longer be with that individual anymore. Things are no longer the same so, you and the other must move forward in life. You don't want to dwell and hurt them anymore, so you say goodbye through a kiss . A goodbye kiss can leave someone in their feelings . A goodbye kiss also gives closure on that relationship , so the two can move on. Sometimes a goodbye kiss can be the last kiss.
Him: " We can't be together anymore."
Her: "Why!?? I don't understand!"
Him: " I'm bout to go."
Her:" Please don't ! "
Him : * kisses girl goodbye *
Her: " What was that for ??!"
Him: " It's a goodbye kiss."
Her: * starts crying*
by Jena74 July 4, 2017
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Noun: Shotgunning your girl with a bong hit before you leave to do something important
"Babe you know i love you" *cough* *cough* ...
"Damn that's some good shit!" "Thanks for the goodbye kiss!"
by Phyphy May 4, 2016
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The last time you kiss your steady, because him/her has to move out of town. And it will be the last time you see each other.

This is very emotional for both steadies.
Steady1: Baby? Can I have A Kiss Goodbye?
Steady2: Of course sweetheart, Goodbye Baby. I love you.
by Mr Psychotic May 7, 2010
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Blow job until ejaculation and the boner has become limp.

Long refers to the duration of the act.
Kiss refers to her lips on a man's dick.
Goodbye refers to the sperm and a mans boner going away after the act.
Man1: She gave me a long kiss goodbye right before I left for work.
Man2: aww sweet man.
by Give me a BJ biotch February 14, 2014
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A series of actions:

1. Driving your girlfriend home.
2. Receiving a blowjob on the way. (ie roadhead)
3. Shooting a load of tonsil jelly down her throat.
4. Breaking off the relationship with her permanently.
5. Driving off leaving her crying on her doorstep, broken, ashamed, and feeling like a whore.
Bryce gives the long kiss goodbye to all of his girlfriends.
by Bryce loves it September 7, 2008
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