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1.
When one person (person A) gets on all fours behind a person (person B) standing without then knowing. Person C, who is also standing facing person B, shoves person B, forcing them backwards. Because person A is directly behind the legs of person B, they are unable to take a step back and fall rather ungracefully backwards, often scared and bewildered.
After being low bridged, Jeff got up swinging his fists, even though his ass and head were in great pain.
by CONSTANTINES VISION July 18, 2008
 
2.
Kicking Or Punching Someone Below The Waist (Groin,Shins, Thighs)
Most Commonly used such as "I'll LowBridge ya!" Or "Give Him A LowBridge"
by Im Rick James Bitch (haha) October 20, 2010