idbyou Share definition Flag I Don't Believe You; used easily in Instant messaging conversations. But when spoken it is IDBY. SAM: dude last weekend i got totally wasted and don't know what happened J.R.: idbyou SAM: whatever jerk idbyou by DBAS March 30, 2008 0 0 Get merch Get the idbyou mug. Buy Now — $32.95 See more merch
