(obsolete) To burp.
1997, Alan Warner, [http://books.google.com/books?id=ruWZweEYGCoC&q=%22to+boak%22&dq=%22to+boak%22&lr=&pgis=1 Movern Callar]:
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(Scotland) To retch or vomit.
: I was going to boak: I made the window and opened it but most of the sickness hit the window-sill in a heap.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.