police code for crazy one on the loose. Danger to property, danger to others, and danger to themselves...
you better call the cops before she goes 5150 on your ass!!
by elementau January 28, 2004
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California code for a legal involuntary 72 hour psychiatric hold.
We 5150'd him against his will and sent him over to the inpatient facility.
by Anonymous December 18, 2002
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A danger to self & danger to others
the people who define this before me are 5150s.
by Beny boo bear February 16, 2005
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police term for "Danger to themself & others" somehow adopted by motorcycle Stunters to mean "Crazy" even though the correct police term for Crazy is 800
check out the guy on the R1, he's straight up 5150!
by Mr Wall February 8, 2006
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1. California police code used to denote an escaped criminally insane person.

2. An album that hit in 1986 by Van Halen. It's the first album by the "Van Hagar" lineup. Also, the album's name comes from the studio it (and 1984) were recorded.
1. Positive. This is Sgt. Pepper reporting a pursuit of a 5150. Do you copy?

2. This is dialog from a VH concert I went to.

Sammy Hagar: And just does "5150" mean?

Mike Anthony: It means that you're a crazy motherfucker!

Crowd erupts in cheers.
by I Saw U2 Live Twice January 3, 2007
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The Peavey 5150 Amplifier was an all-tube guitar amplifier made by Peavey Electronics from 1991-present, that was made as a signature model for Edward Van Halen. The amp series was designed by a partnership of Peavey Engineers and Edward Van Halen. The 5150 was originally designed to achieve Van Halen's lead tones; however, due to the amp series' power, flexible equalizer, extreme hi-gain capabilities, and retention of articulate tonal definition at extremely high volumes, the amp series became the standard for modern hi-gain metal tone. Since Edward Van Halen and Peavey parted ways, in 2004 the name of the Peavey model was changed to 6505, with Van Halen taking the 5150 name for his company, EVH, to name his 5150III amplifier.
A lot of bands use the 5150 for studio and live preformances.
It is to be considered one of the most widely used valve top in metal/rock gernes.
by Jack Lupino January 23, 2009
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The name of a 1986 album by Van Halen.
5150 is the greatest album ever to be released.
by matthew September 28, 2004
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