simply means retarded in german, you may also use in english as a 'Diss' without people understanding it. have fun saying it, its a funny word.
Sophie: Hallo, gut morgen Abbie.
Abbie: Ist die morgen?
Sophie: Ja..
Abbie: Oh, ich bin zuruckgeilben.

translation:

Sophie: Hello, good morning Abbie.
Abbie: Is the morning?
Sophie: Yes..
Abbie: Oh, i am retarded.
by Ilikerumxox June 1, 2010
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