A relationship formed between two guys after they have had sex with the same person
Guy 1: "Yo I just slammed Kayla lay night."
Guy 2: "No way! I slammed her last week!"
Guy 1: "Dude, Viking brothers."
by Bassboi November 15, 2014
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Similar to the popular term Eskimo Brothers; Viking Brothers is when you have motorboated the same girl as a buddy and remain on good terms with said buddy. Unconditionally
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Male 1: *Motorboats big tittied stripper

Male 2: *Motorboats same big tittied stripper

In unison: Did we just become Viking Brothers?!

Yes.
by RadDad69 April 26, 2021
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