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
1. Will somebody buy me a D-Lock? I'm scared my bike will be looted!

2. D-Lock that fucking Nazi Kid! He tried to rape a 14 year old!
by Warnes August 9, 2006
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D (dick) on lock. Keeping a very close eye on your man. Always looking to see if he's cheating to try to prevent him from being with another.
He is fine af but his girl got that d on lock.
by AJ Banana Puddin' June 15, 2017
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