older sister theory

the theory that states that all older sisters are hot no matter what

if some girl is ugly and then has a younger brother born
she will miraculously become hot

the older the younger sibling, and the better you know them, the more satisfactory it is to gawk at their sister
especially if the younger sibling is male

if there is a not hot older sister:
1-they have a penis
2-they have a disorder
3-they are bangable at the very least
4-they do not really have younger siblings
5-you are living a lie

guy1-i bet your sister is hot
guy2-how would you know?
guy3-older sister theory, duh.
guy1-id love to watch her in a porno
guy3-rule 34 man
guy2-i assure you there is no porn of my sister
guy1-rule 35
guy2-blasts

by handsomevirgil January 16, 2010

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older than methuselah

someone or something that is really old.

gramps is still alive? Damn he's older than methuselah

by eli7002001 July 22, 2005

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older brother syndrome

OBS is when your guy-friend is wayyy too much like an older brother...overprotective, and hates anyone who touches you..or talks to you..or looks at you the wrong way. Sometimes as annoying as a sib, but you love them anyway:)

Guy: Hey gurl, wanna go out this weekend?

Girl: SURE!

Girls Best Guy-friend: Who is he? What does he want? Why is he talking to you?

Girl: Dude, chill it with the OBS (older brother syndrome)

by PIAFFE September 10, 2013

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The Older Sibling Effect

Generally perpetuated by older siblings, this effect takes place when something is so hyped up or raved about by someone, that you grow to despise it.

I was going to watch Stranger Things, but John totally gave it the older sibling effect for me

by Xix August 2, 2019

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