Top Definition
Acronym for "I Don't Know Why But I Believe Him" (or Her)

Used on forums and message boards, especially PT. Often said sarcastically in response to an outrageous claim with no evidence backing it up.
Poster 1: Phish to play on Mars next Summer.
Poster 2: idkwbibh

Scientist: Stem cells cure blindness. Trust me I'm a scientist.
Reader: idkwbibh
by chupon November 13, 2009
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