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4.
Bridging is a lesson for individuals in a school to catch up but is often considered as a "DOS" in which you can play games on the computer.
Mentioning of the subject Bridging will usually be greeted with a cry of WHEY! from all persons nearby.

Apparently 4 GCSE's can be obtained from this dos lesson.
Michael: You in Bridging next, Jonny?
(Greeted by a cry of WHEY! from all nearby persons)
Jonny: Yeah, it's a dos, I might just Chong the Bhudda and play games whilst achieving 4 A*
by BhuddaChonger. November 27, 2009
 
1.
A prison term for when a non-circumcised inmate takes his penis’ foreskin and extends it over the tip of another inmate’s circumcised penis.
Warden in shock: "What are you two doing?"
Inmate #1: Bridging, Warden.
Inmate #2: Yeah, bridging.
by Jebus78 October 05, 2009
 
2.
To have gained a rapport with a person of the desired sex only to have it quashed by saying something that is ridiculous or overly 'nerdy' you kill the conversation.

Origins of this terminology date back to an occurrence on a New Zealand Contiki tourist bus in which a man was talking to a woman in a way some would call light flirting. All was going well until he started going on some tangent about how the Auckland bridge's original designs had etc etc. Hence killing the conversation. It is from here we take our term Bridging.
Person A: How's John going tonight?
Person B: He's been bridging all night.

Please Note: this term may be altered slightly to fit more grammatically into sentences.

Eg. 1)He's such a bridger

2)I just bridged out so bad
by Casp3r February 09, 2011
 
3.
Similar to "Planking" except by someone with a rather large derrière
Fancy a game of bridging fat arse?
by Hilariousasiangenius May 23, 2011