The Boundary that you cross when you go from being just friends, to "friends with benefits"
"Dude i totally crossed the boundary line last night with vanessa!"
by Awesome ausie May 19, 2009
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A type of country boundary that no longer exists, but still has an affect on how countries/a country function(s)
Man: Why does it still look like Germany is still decided even though the border doesn’t exist any more?
Woman: that’s because it’s a relic boundary
by Picklerickshaw April 22, 2022
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1: To describe your own personal space, especially when it's one particular person you don't want there.

2: A city or town's "city limits." Used mainly for cities and town's that think they are better than their surrounding communities.
Example 1:

Dude, you're totally invading my urban boundary. Get the hell out!

Example 2:
Jimmy: Dude did you see that towns urban boundary sign?! Why can't they just say, "City Limits"???
Tommy: Yeah!! That's the gayest thing I've ever seen. They must be assholes!
by tigergal0075 June 16, 2008
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a boundary that can be broken, but not often and only when really needed to
Mags and Jake set a loose boundary to not have sex, but if it happens, it happens
by wowhore May 26, 2011
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this is sliding slabs of stone that each country is situated on which interact to form land forms and hazards like earthquakes or volcanoes
the specific plate boundary is located under europe
by A1 Saydia October 22, 2020
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The Geneva Rectal Boundary is the point in the anus at which no man, woman, strap on, vibrator, sentient pleasure machine or natural disaster may penetrate, as it has been declared a war crime. It's generally accepted to be 89 kilometres deep.
TJ was arrested for traveling 89 kilometres deep... Poor sod. Should've read up on the geneva rectal boundary
by Mr. Tiddles12345678910699 February 10, 2014
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The act of laying next to your partner in a tent while camping. The receiver unzips the rear portion of his sleeping bag and the giver unzips the front of his. They are connected via anal sex this imitating the side car on a motorcycle.
Things got weird on the island last night. We ended up having 18 cocktails and firing up the ol’ Boundary waters side car.
by MNAngler December 26, 2022
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