The Scotland/Northern Ireland idiom for gagging without vomiting.
NOTE: The idiom is *the* dry boak. It it never *a* dry boak.
It is from this idiom that the word boak escaped to take on a life of its own (along with the alternate spelling boke) -- with some people using boak (or boke) to mean "the dry boak," and others meaning normal vomiting.
"It would huv gied ye the dry boak tae hear them sookin up tae him, aw sweetie sweetie." (Anne Donovan, Hieroglyphics: And Other Stories, 2001)
The action of placing a towel on the floor (under the door) to cover the gap left between the bottom of the door and the floor. This will prevent any smells (like those created by the burning of illegal drugs) from escaping the room and contaminating common areas.
"Towel the door" can also be used as a command to someone telling them to do the action previously described.
If your gonna smoke, just stick a towel under your door and use a fan to blow the smoke out the window.
Kelly: Towel the door, bitch so this dank shit doesn't stink up the hallway.
Dan: Why don't you just use a sploof.
Kelly: Your a dumbass, you have to use a sploof in conjuction with febreeze, a fan, and toweling the door.