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a variation on ibl, or 'in before lock'.
The '+1' is a term used to recognise that you just increased your post count by one.

ibl +1 is used as a term in which you declare the increase of your post count on a thread that will/should be locked.
omg l0lz IBL +1 !!!!!one1!
by Garamiah June 17, 2006
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