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Slang for LSD (d-Lysergic Acid Diethylamide). It is a shortened form of "acid."
by Adam C. July 11, 2003
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
Drug slang term for lsd, or "acid". Considered by myself to be one of the most useless and stupid terms because it is only one letter away from the actual name of the drug, duh.
Mike took two blotter tabs of that cid and was tripping out for 12 hours.
by d.roc December 29, 2006
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3
Crime Investigation Department: UK undercover police officers, a.k.a 'Cunts In Disguise'
'the fuckin CID (cunts in disguise) were tryin ta follow us, so we lead them down an alley and ambushed them haha'
by fuckyourpickysystem November 06, 2005
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Escort term meaning 'Cum In Deep'.
The escort lets you cum inside her with no condom.
she loved it when i CID.
by i'm-rick-also December 12, 2008
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5
contraction of acid. used in Emin3m's song my name is
Wanna copy me and do exactly like I did? (Yeah yeah!)
Try 'CID and get fucked up worse that my life is? (Huh?)
by rawyak December 25, 2011
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6
A guy who apears in every final fantasy game and usually has something to do with airships
Tidus: wow shit to much machina
Wakka: Cid better get his big airship butt down here quick ya?
by D-nd October 18, 2004
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