I like how ‘boak’ is used like a Chinese word, it’s a verb and a noun all at once.
The most popular use appears to be, “_____ gave me The Boak.”
Here, clearly, it means _____ has given our speaker a feeling of nausea.
You can also say that someone (or yourself) Boaked. I have Boaked many times in my life, most notably in front of the church I used to attend (in the drain, lah, I’m not so disrespectful of other people’s property, even when I’m hammered).
Here is an image of The Boak:
Solomon the tiny turtle drank a lot of Edradour whisky, and it gave him The Boak. He Boaked, and got Boak all over the table.
I’ve never heard of someone Boaking, though.

Comments
28 April 2007
06:46
TuTu
It’s appears like a description of the sound sometimes made during the aforementioned action… like to ‘ralph’, or to ‘barf’, to booaaakkkk… ergh!
30 April 2007
08:05
Andrea
Hehe. Too true.
17 January 2008
13:23
David
I think you’ll be interested to see boak is not slang at all (nor onomatopoeia):
http://en.wiktionary.org/wiki/boak
My family is from Lanarkshire and I heard it a lot in my youth, e.g. “he gives me the dry boaks”.
So…descriptive!
17 January 2008
14:49
Andrea
Is it more a Lanarkshire thing than anywhere else in Scotland, David?
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