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Someone who is walking slowly in front of you, forcing you to slow your pace and try to get around them. The D-Brake often incorporates a side to side motion into their walk, making a successful pass difficult.

Short for douche-break.
Sorry I'm twenty minutes late, I got stuck behind d-brake after d-brake in Chinatown and eventually just had to start shoving people aside.
by PawlPawka April 23, 2011