Top Definition
Acronym for "Yeah I'll be there". Commitment to be present at an event, set for a specific time and place, expressed with an extreme lack of sincerity intended to be understood with sense of hipster irony.
X: "Hey Y, are you going to be at my wedding next year?"

by extremelyboredofwork December 05, 2013
Acronym for "You're in Big Trouble"
Billy: "I just broke mom's favorite vase!"
Billy's Brother: YIBT
by dirdles June 03, 2009
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