improve your brain; used when someone says something stupid
Agata: "I saw this in a dream"
Liam: "Your Psychotic?"
Janik: "you mean Psychic..iyb..."
by keeroonf April 08, 2009
Top Definition
in your butt
my husband keeps leaving my notes that end with iyb after his name
by gloucesterdave1 December 01, 2011
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