Strictly it is when air is pumped into a vagina during intercourse, and released when the penis is pulled out.
Urban myth? Definitely not.
Talking from personal experience. They are not so smelly as ordinary farts though.
Also somebody insignificant.
A sexual structure resembling a hutch or cave made by reconfiguring the individual components (mattress, cushion pillows, etc) of an existing piece of furniture (bed, couch, etc).
When Greg is away at school, his mother and her new boyfriendTerry spend most of their time building a fuckfort out of Greg's threadbare bed.