stuffing your unerect penis into a condom and throwing it into a vagina
Tiffany: ...it feels loose, are you duffle bagging?
Near: yea, well deal with it.
A form of autoerotic asphyxiation in which an individual is zipped up and optionally padlocked in a large carryall, preferably from The North Face.
Hey, did you hear about that maths wiz code-breaker from MI6 who died while duffle bagging in his safe house flat in Pimlico?