bonk v. in bicycling, to become exhausted. Also bonk out and bonking, n. Editorial Note: Eric Partridge dates this term to the 1930s in his Dictionary of Slang and Unconventional English (8e, 1984), but no citations are given. Editor Paul Beale...
bonk n. a sound made by a hand-held radio, indicating a transmission cannot be made, characteristic of digital trunk radio systems typically used by fire and police departments. Also bonking. (source: Double-Tongued Dictionary)