The act of "shoving" or strategically placing your flaccid/semi-plump penis into an already stale vagina. This simulates stuffing smelly, wrinkled cloths into a duffel bag that's too small. This uninspired state of one's floppy member is known by many names. However ,this concentrates solely on act, of "Dufflin'"
Lizzy- "Is it...?...Is it in?....."
(Troy's inner monologue- "........I'm just gunna Duffel Bag-it.....she won't know the difference, especially after that Xanax kicks in.")
When a man is so hammered drunk that he can't maintain a erection, so he throws his half flaccid hog into the bitches snatch like a duffel bag in the trunk of a car.
Mason: So how did things go with Kerry the other night?
Joe: Well I was shitfaced and she wanted to fuck, so I was Duffelbagging her for about 10 minutes then I fell asleep Mason: Did she call back today?
Joe: No....