Bro / Sis

Have you wondered why you are being called bro? and sister? well its time to know buddy!

this is how Bro And SIster is used as a sentence For Example if you don't know this Then How would you define Bro / Sis
Hey bro! for example that means Hey Brother

and now the sis for example =
Hey Sis! That means Hey Sister meaning his sister

B

its just describing that your bald or bad or whatever like babe.

thats my b!
now second is bad.
aren't you b at school?
third is bald
you have no hair seems like you are b.