1. Noun: A D-shaped lock used for clamping a bicycle to various objects specifically used to keep it secure in public places. Requires Key to Unlock.
2. Verb: Using said Lock around a victims neck. Causing severe
annoyance and mild pain for
prolonged periods of time due to the key being hidden/
swallowed. Best reults at keggers and at house parties. Reasonably Humourous