Top Definition
An alternative to FYI, used to abbreviate "For Your Information." Use of 4YI is a suitable alternative to looking like the office douchebag who overuses the FYI term to bombard you with irrelevant information.
4YI - There were donuts in the break room, but I ate the last one. You totally missed out.

by Chi_hooah_hooah December 03, 2009
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