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1.
Verb used to describe the action of fornicating through the frayed hole in a urine-soaked hessian sack.
Sophie loved the feel of the sack-cloth rasping against her naked flesh while Adam duffled her.
by Dirty Animals August 04, 2009
 
2.
(v.t.) to duffle: term commonly associated with the smothering effect from a larger-than-average bloke copulating with a smaller-than-average chick in the missionary position.
"I got a right duffling last night" (female)

"It was awful - I think I duffled her"
by Andy Duff July 30, 2004