It's another way of saying "what's up?" It is not shorter then what's up, but people like to say it anyway.
Person 1: Hey, what's it to ya?

Person 2: Oh, just hanging around.
by Lexina March 17, 2011
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A rhetorical question indicating the speaker's displeasure with the subject.
MR. HORSE: Hey, Muddy! Don't hit me with that mallet!
MUDDY: Shut up, you! *WHAM*
MR. HORSE: What-are-ya??
by Davoise December 25, 2010
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Its a slang word for how are you doing, today? how are you? whats up man? How is it going?
by That_itesot June 25, 2017
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Noun : thats word expresses what you do in a jam situation or what you're doing in order to figure out the solution to do, what you doing immediately : What are you doing? , Whatcha doing? Or what you doing? What you're doing for finding the solution right now
What is ya doin?

Kamayi: hey, waddup?

Elie: doin ok , you?
Kamayi: what is ya doin?
Elie : nun at all...
by E.s.Kamayi7 May 25, 2021
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“Yo what’s up it’s ya boy young megaphone” is another way of saying hi but for cringey people that are addicted to TikTok (me)
“Yo what’s up it’s ya boy young megaphone how a are you today
by Tik tok addiction 101 September 6, 2019
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