When a male and female have slept with the same female.
Person 1: Did you hear Halee and Louie both hooked up with Chrissy?
Person 2: Yea, they are defintley slippery siblings!
A brother or sister that have the same mama and a different daddy...
"We don't know who mama's baby daddy is, but the little bastard's gonna be my half sibling..."
32π 24π
One adult child whose siblings allow, by deferment, silence, or proximity, to assume and shoulder the predominant responsibilities of caring for an aging parent.
A sibling sucker with no time to call their own, can grow to be an angry angel.
A sibling sucker is usually performing one of the most difficult and thankless jobs on the planet.
A sibling sucker spares brothers and/or sisters of their equal responsibility which might "God forbid" interrupt their busy lives.
A sibling suckercan be one whose halo has fallen a few inches to become a noose.
4π 1π
A person on facebook who adds everyone they know as siblings. They usually have over 40 siblings and relatives listed.
Jen: Duuudee did you see Jane's facebook page? She has like fifty siblings listed and I dont even think she has ten real friends.
Bob: Whatta sibling whore!
4π 1π
From the infinitive 'to sible' (pronounced 'sibble'), meaning to perform some form of sexual act with another persons brother or sister (preferably younger for greater novelty value...though not TOO much younger). For clarity in use, the given example would mean that to sible 'her', would be to sleep with 'her' sibling.
'Dude, I would totally sible her...soon as her younger sister's street legal of course.'
'For sure dude! I'd give her the sibling of a lifetime.'
3π 48π
To become shit siblings, two people must each first take a shit, collect the shit and keep it in typical shit-form and then freeze the shits. After the shits are frozen thoroughly, the two parties will exchange their frozen shits, stuff their prospective shit-siblings' shit into their own asses and proceed to reheat and then re-excrete the the pre-fab log. They are now officially shit-siblings.
Who cares if you're blood brothers? Me and So-And-So are shit-siblings; way cooler, and way shittier. Ain't that some shit?!!!!
3π 2π
Your new sibling after your mom/dad remarry and have a child or bring a new child into their family
Alex: My dumbass dads getting married next weekend and then Iβll have a new step sibling and dude she fuckin hot as hell and sheβs got some great biscuits and tits
Riley: damn dude ... can I date her then?
5π 2π