The sick-bag is an act reserved for no strings attached college sex. The act involves drinking obsessive amounts of hard liquor, preferably Johnny Walker Red, and convincing the female to allow you to provide oral stimulation. Wait until you are about to be sick to begin the act and make sure to pull the labia open in order to vomit highly acidic liquor vomit directly into her vagina, aiming for her cervix. Thus using her vagina as an airline sick-bag. Coitus after vomiting will help to ensure that the smell will never come out of her Netherlands.
Oh dude, I got blitzed at theta chi last night and totally gave that bitch the sick-bag!