2.Sport. (A sudden attack of) fatigue or light-headedness sometimes experienced by racing cyclists and other athletes (see quot. 1983). slang.
**3.** An act of sexual intercourse. *slang*.
4. Special Comb.: bonk bagCycling slang, a small bag for carrying light food that can be nibbled while racing so as to prevent ‘the bonk’ (sense 2 above).
**5. **Where I sleep.