The act of throwing up and pooping in the same hole (usually a toilet) at the same time.
"How was your night, man? I only saw you at the party for a bit."
"Dude, it was great. I had my first front-back yack. It all landed in the toilet too; none on my clothes."
"Dang, that's pretty impressive."
by fby_guy May 16, 2019
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the act of puking your brains out after drinking heavily, then come back and start drinking all over again with a empty stomach.
Its best to yack and come back if:
-your drinking all day,
-then go to a chinese buffet.
this is what should follow that:
-then go to the parking lot,
-stick your fingers down your throat
-puke
-then go back inside and eat and drink again
by M2million December 8, 2006
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1. When a male is t-bagging a woman and before he ejaculates turns and shits on her face.
2. Also may be used as a way to express anger.
1. "Hey Bill last night Linda let me do shit-cock-yack balls, and it was fantastic."
2. "Shit-cock-yack-balls! I died in Call of Duty again."
by Steim_Time March 18, 2009
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Hey bro! Why are you so sleepy today?”

Yeah bro sorry, I yacked one out last night”.
by Bangkok thai April 12, 2018
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When ur sippin it proper wiv a bottle of glens vodders
What you sippin on tonight g?

Yack in my cup das glens
by FactsOnly__ December 11, 2021
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To talk incessantly! Blow one’s phone up.
Look at that poor guy over at the bar, that girl is yacking the alphabet off. Yeh he can’t get a word in.

I am so sorry I was yacking the alphabet off yesterday. I will refrain from blowing your phone up
by Yetilove August 24, 2021
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The computerized voice of a busines's automated switchboard, the "out-of-service" recording.
I called, but I got a yacking Eulah instead.
by ABDL2023 August 1, 2023
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