Top Definition
(acronym), stands for In Bed, Lights Out

When you get to bed whilst texting or messaging a friend/significant other feeling sleepy, and you want to warn them that you may fall asleep at any moment (even mid-conversation), so, should it happen, they won't be worried that you hate them/had a stroke.
Guy: Hey, btw, IBLOW

Girl: Wtf??

Guy: ..............
by gingernutter April 11, 2014

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