When two people who are in love “Mark each other’s territories” by urinating on one another.
“Bro I peed on my girl last night.”

That’s dope dude, I’m proud of you for marking your territory.”
by Anonymousbabes86 May 3, 2021
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Some animals cover an area with their scent to warn any other animals that they will not tolerate any competition in the area. Typically by pissing and shitting on it.

The animal marking the territory is usually already feared. If it isn't, it may have to enforce the marking of territory by initiating conflict with any animals that violate his territory.

This is usually an expression to refer to warning off potential competition.
Jenny: My husband has all these attractive female co-workers? What should I do?

Friend: Get to marking your territory. Put your best photo on his office desk. Have him leave with a ring on his finger.
by Sovereign2314 November 14, 2014
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