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1.
=Through.
I saw thru her clothes.
by Fangsta March 17, 2003
 
2.
Common misspelling of 'through' due to laziness and/or ignorance.
Carl: Hey, let's go to the drive-thru!
Paul: No thanks, I don't eat food from a company with English skills of a 3-year-old.
by Morris Fairfax October 19, 2005
 
3.
Abbreviation of 'through'. Most commonly used in drive-through lines or highway signs.
DiggityMonkeez: Go thru the tunnel, and exit 17 will be...

ElGrammar: Did you say "through" or "thru"?

DiggityMonkeez: Does it matter? They both sound the same.

ElGrammar: Yeah, but the direction of our conversation hinges on which word you chose.

DiggityMonkeez: OK, OK! I said "thru"! With a 'u'!

ElGrammar: Oh, OK.
by Diggity Monkeez January 11, 2005
 
4.
ugly or weird. different
She is thru.
by RHS class of 05 October 20, 2003