Note that vomiting is, duh, with vomiting (wet), and retching is without vomiting (dry), and the word boaking can mean either.
NOTE: For the non-"ing" form, boak, there is an explicit retching phrase: the dry boak (which is a noun).
Like many "ing" forms of verbs, boaking can be used as an adjective: the boaking bridesmaid, the boaking jerkwad who drank all my good scotch, etc.
"I pull some Kleenex out from my jacket pocket. I always keep them handy for wiping purposes as you never know when some tight arsed cunt at HQ supplies will run short. I hand the boaking mess a couple. -- There you go mate."