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1.
Acronym for Do It Fucking Right. Often used in the context of "I beg to DIFR" as a reply to someone who suggests taking a lazy/cowardly/stupid and possibly damaging course of action.
Student pilot: During preflight I noticed some little cracks in the rudder hinge, but it's probably nothing. Let's get up there, I'm eager to practise spin recoveries.

CFI: I beg to DIFR. This aircraft is unserviceable and must be taken in for maintenance immediately. Epic fail.
by Gun Arvidssen January 15, 2009