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B: God, who's gonna go back there to get it? you're def. a DF (dumbfuck)
B: God, who's gonna go back there to get it? you're def. a DF (dumbfuck)
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noun | verb | aviation / military slang
Definition:
Innate common sense. The kind of baseline understanding you’re expected to already have without being taught. If you need it explained, you probably don’t have it.
Derived from the idea that nobody teaches a dog how to fuck — it just knows.
Often used by instructors or senior aircrew to signal that a question or mistake should have been resolved through basic reasoning rather than instruction, checklists, or instruments.
Common misconception:
“DF” is frequently misunderstood by students as Direction Finding (ADF/navigation). In context, it actually means use your common sense, not your radios.
noun | verb | aviation / military slang
Definition:
Innate common sense. The kind of baseline understanding you’re expected to already have without being taught. If you need it explained, you probably don’t have it.
Derived from the idea that nobody teaches a dog how to fuck — it just knows.
Often used by instructors or senior aircrew to signal that a question or mistake should have been resolved through basic reasoning rather than instruction, checklists, or instruments.
Common misconception:
“DF” is frequently misunderstood by students as Direction Finding (ADF/navigation). In context, it actually means use your common sense, not your radios.
Instructor: “Which way is the base?”
Student: *Muffled noises and the uncertainty of a CO in the Vampire hall”
Instructor: “Just use your DF”
Student: “Uh… it’s not tuned, sir.”
Instructor: “Not the fucking radio, Jones. Your DF. That big wet thing in front of you is the ocean. Base is not in the ocean. Use your dog-fuck. Jesus Christ.”
Student: *Muffled noises and the uncertainty of a CO in the Vampire hall”
Instructor: “Just use your DF”
Student: “Uh… it’s not tuned, sir.”
Instructor: “Not the fucking radio, Jones. Your DF. That big wet thing in front of you is the ocean. Base is not in the ocean. Use your dog-fuck. Jesus Christ.”
by Hdlm February 9, 2026
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