[from SF fandom via Usenet; abbreviation for ‘In My Humble Opinion’] “IMHO, mixed-case C names should be avoided, as mistyping something in the wrong case can cause hard-to-detect errors — and they look too Pascalish anyhow.” Also seen in variant forms such as IMNSHO (In My Not-So-Humble Opinion) and IMAO (In My Arrogant Opinion).