When pockets of air get trapped under one of the many rolls of fat of an obese person, the release of that air and the sound it makes is a Boif. Much like a similar phenomenon that occurs in a woman's vagina, the queef.
Professor: I took a look at that rough draft you emailed me for your term paper. How can i say this? You sound fucking retarded. Everything was misspelled.
Student: God Dammit i thought i got rid of that Boifedot infecting my computer.
Professor: Oh...well in that case i completely understand and fully sympathize...you still really suck at grammar and spelling.