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Euphemistic term used by a criminal suspect to ask police for a maximum of only 8 years in prison in exchange for a full confession to the crime for which he or she is charged.
Detective: We know you killed that old woman -- your blood is all over her apartment and on the knife sticking out of her dead body!

Suspect: Look, I already told you -- I ain't saying nothin' unless you give me a straight-8. If you can do that, I'll give you what you want.

Detective: 8 years for cold-blooded murder? I don't think so.

Suspect: Well, if you want a full confession, you know what I need.
by Dr. Dave September 08, 2004
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A now obsolete type of automobile engine that used eight cylinders in a row, instead of two rows as a V-8 engine does.
The old roadster had a straight 8 engine.
by Unidyne March 11, 2005
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1. A type of handcuff in which the two cuffs are one solid piece rather than being joined with a chain.

2. A gay or bisexual man (or a man or woman of any orientation?) who enjoys sex play, i.e., BDSM.
Straight 8 Bi Guy here, looking for other straight 8 guys for friendship and possibly more. (From an actual personals ad)
by Tony S. February 03, 2004
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