Top definition
Meaning Shut The Fuck Up. The 4 represents shut. The 3 represents The. 4 Represents Fuck. 2 Represents Up. This is a play off of 143 (I Love You). This is the New STFU.
1. Hey You. 4342!

2. Mark: Don't talk to me.
Christa: Why?
Mark: 4342 Bitch.

3. Some people can't 4342 these days.
by jackyamada June 19, 2010
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