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(noun) refers to the act of vomiting (just a little) in your own mouth as you burp. Also known as a "vurp".
I was leaning over to tie my shoe when I had a quack back. I had to swallow real quick before my date noticed.
by uuddlrlrbabastart September 29, 2005
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The act of securing your seat so nobody can sit in it. Has to be called IN the seat.
Kayne: Quack back
Sarah: (sits in chair)
Kayne: (comes back) Get up I called quack back
Sarah: Dang it
by Thiccboiroy July 02, 2018
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