The act of farting in bed and pulling the covers over your head to see if you can gag yourself. A form of self-mutilation but limited to nasal passages.
Bobby decided to punish himself for eating that 3rd bowl of chili by performing self-flatulation at bedtime.
flobulation, or flobulations: the excess rolls of flob, or flab, hanging over the top of someones trousers or jeans or skirt, caused by someone squeezing into trousers that are too small.