A euphemism for someone’s arse, posterior, anus, or shitter. Popular amongst the armed forces deployed to sort out the whole collapse of Yugoslavia schemozzle. (See also Garry Glitter)
She totally pegged him, took him right up the Balkan Retreat.

So I said to him for your birthday we’re doing something special, you can enter my Balkan Retreat.
by The Big Effin’ Gee May 12, 2021
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You've had a night out, you got drunk and went home with someone to their place. Sex was had and you went to sleep happy, satisfied and wasted.

You wake up the next day and suddenly realise what you did. Full of regret (for whatever reason), you then try to make a silent retreat so last night's partner doesn't notice you leaving and ask any awkward questions (like "can I call you?")
Henry: It felt so right at the time, me and Sarah had this huge argument, this girl was all over me and pretty soon we're back at her place.

Eddie: Oh geez...
Henry: Yeah. I wake up next morning to find myself next to this complete stranger lying asleep and text messages from Sarah telling me how sorry she is.
Eddie: What did you do?
Henry: Make a silent retreat. Last thing I needed was her asking me for my number.
by WatcherMark May 24, 2019
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When you go on a retreat and create so many new memories, friends, and relationships then come home. Turns out you miss retreat a lot because, admit or not, it was more fun and better than your regular life, and then too nothing at home is the same as at the retreat so you become nostalgic, sad, or even depressed because of the vast difference in lifestyles.

Despite that definition, retreat high is a great thing because it means that you are not the same person that went to camp, and that the camp changed you for better!! So recognize it, work through, reach out if you need to, and move on with those beautiful memories, friendships, etc that you made! That’s awesome that you have retreat high. Plus, it usually goes away when you go back to school or work or something AKA when life becomes busy again!
Man, I just miss camp. I miss my friends, I just wanna rest. Camp was good and being home is even better because it’s restful but idk, am sad. I think I have retreat high OR I think am I got retreat high! :(
by Mk23Aka July 8, 2022
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