YWK Views 4 meanings found YWK serves as internet slang for “You Would Know,” appears in creative expressions like “Your Worst Nightmares,” and is also the technical designation for a long‑wave beacon and a Canadian airport code. Miscellaneous Your Worst Knightmares Academic & Science Long Wave Beacon, 184.320 kHz Regional Wabush Municipal Airport, Wabush, Newfoundland, Canada Internet You Would Know