Usually an old bag or ugly bag you pick up or sit next to on a jet or plane trip.
Refers to the bag you spew in on the plane.
"Hi my name's Tish." "I guess we'll be sitting together for the next 20 hours?"
"Fuck'in great!" "Sitting next to a Jet Bag!"
"Well hello and fuck you to pig!"
"Yeh!" "Yeh!" "I'll fuck you later bitch!" "Just give me a minute."