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1.
In the 60's, a girl would get pinned by a guy when he made her his girlfriend. Ya know, after many dates, and the guy was ready to call her his girlfriend, he would formalize it by putting a silvery pin on her. So getting "pinned" means u are now taken. Watch the Dick Van Dyke version of Bye Bye Birdie, especially the song "The Telephone Hour." They use the term pinned quite a lot.
Have you heard about Hugo and Kim?
Did they really get pinned?
Did she kiss him and cry?
Did he pin the pin on?
Or was he too shy?
Well, I heard they got pinned...
by dave February 11, 2004
 
2.
Telltale sign of Opiate intoxication; Large doses of Heroin etc cause the users' pupils to shrink to tiny pinpoints - which to the practised eye , a drugs worker say , easily discredit a junkies' protestations of sobriety
Huh..? Reckons he's been clean for months ? Yeah right ...check 'em out! He's well pinned!
by Bohemond July 12, 2006
 
3.
To hold somebody immobile.
Festivus isn't over until the head of the household has been pinned!
by Rind April 28, 2004
 
4.
In basketball, to get one's shot blocked and pressed against the backboard at the same time by an opposing defender.
Hahaha... you got pinned!
by cheapsoot November 30, 2011
 
5.
To hit a car's top speed while driving.

Comes from driving a vehicle so fast that the needle on the speedometer hits the pin after going around the dial and off the scale.
Gentlemen, we have just hit terminal velocity; our golf cart is pinned.
by mrcrankypants July 17, 2004
 
6.
The feeling you have when you have crossed the "having fun" phase of doing cocaine into the "a new source of natural energy" phase of it. May also be used to describe the feeling obtained from speed, but with speed, the "having fun" phase is skipped.
Girl: "How are you feeling?"
Guy: "I'm fuckin' pinned."
by Anonymous August 10, 2003
 
7.
Pinned-Going really fast, Hooning!
My god you were Pinned then you Tool!
by Pinner95 July 06, 2011