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."
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
Most Popular Form
Male 1: *Motorboats big tittied stripper
Male 2: *Motorboats same big tittied stripper
In unison: Did we just become Viking Brothers?!
Yes.