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1.
Thou: A word used by holy dudes to speak to holier dudes.
Yo Jesus, man, how art thou?
by Mike Lofthouse April 12, 2004
 
2.
archaic second person singular pronoun version of You. While You was originally used for plural or formal speach thou was used for personal use.
to a friend
What dost thou want?
Thou be'st mine brethren, and i shall love thee.
by theperm March 13, 2005
 
3.
Archaic form of 'you' still used in areas of Northern England
"How art thou today?"
"I'm not too shabby, hows about thaself?"
by cheesuschrist May 27, 2006
 
4.
One thousand units of currency.
That accessory costs three thou. Let's get it.
That automobile must have cost you a couple hundred thou.
by Tyrone112 July 10, 2008
 
5.
Bible-speak for you. It can be used in a Biblical Curse.
Thou art doomed, for thine own spawn shalt be born of hellfire, forthwith!
by Wesley Durrance September 19, 2005
 
6.
1000 meter race.
what's your time for the thou?
gonna do the thou?
i'm gonna thou
i like to thou
by claytonoff June 12, 2010
 
7.
Abridged variant of the word "thousand". Almost exclusively used when connoting monetary value.
Skizzlebips von Hoarscunt says:
I'll fondle yo bag o' elephant skin for a couple thou
Dinklebeard says:
Go right ahead lovely lady, a few grand won't even put a dent in my bank account
by Frank the Disabled Seahorse September 14, 2010