Significant Brother

What two bros in a bromance call eachother. Not to be confused with a homosexual relationship, using this term signifies a strong friendship between two completely straight males. Significant brothers have love for eachother but are not in love with eachother.

Girl: Are you gay?
Bro: Nah, I just have a significant brother.

Some Kid: Do you know Sean?
Some Bro: Know him? Bro, He's my significant brother!

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Significant Brother

A committed partner in a long-term bromance.

Dirk: Hey, you wanna go to the bar tonight?

Lewis: Maybe but I'll have to check with my significant brother first.

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Significant brother

A man married to his sibling/step-sibling.

Pam: did you hear Brittany got married? I wonder who the groom is...
Karen: oh, she married her step brother. Such a good love story, when one finds romance with their significant brother.

(Cue banjos)