Typically used to describe the last encounter between two friends, lovers, or family members before a long leave of absence (or in most cases, permanent).

Note: The literal saying of goodbyes doesn't necessarily have to be drawn out. "Long" only clarifies the fact that the people involved won't see each other again for a long time (if ever).
They said their long goodbyes before Tommy headed out west.

I hate the long goodbye.

I wish I had known that was the long goodbye. There's so much more I would have liked to say.
by MacktheKnife December 29, 2012
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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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When he could no longer look us in the eyes, we thought he was going to give us the long island goodbye.
by Paul the Mediocre June 23, 2009
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