Top Definition
1. K3U is short hand for I <3 U.
2. I <3 U = I love you, basically.
3. K3U originated from Central California in Late 2002.
Girl geek: "I love you, babe!"
Guy geek: "K3U too hun!"
by M. Lohse October 12, 2005
I Love You => I <3 U => K3U

therefore, the I and the < combine to be a K then come the 3 and the U which become K3U
50: K3U Lloyd.
Lloyd: K3U too fiddy.
by J2TEH OOLIA January 30, 2005
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