An embarrassing phrase meant to indicate an inquisitive challenge to someone's sincerity as an interrogative (Honest to
blog?), or a claim of solemnity as a declarative utterance (Honest to
blog!). The phrase found a modicum of popularity amongst idiots back in 2008 thanks to Diablo Cody. It was
lame at the time, and has since fallen further out out of usage. It was one of a number of crappy pieces of dialogue that were deemed Oscar worthy by the
crusty old members of the Academy, who only awarded the film anything because they wanted to look
cool and down with "teen speak" despite not having a
fucking clue what any of it meant or the fact that that no one would ever talk like that. The decline in the usage of a term like "honest to
blog" is perhaps indicative of a growing cultural awareness of of the crumminess of the film's pseudo teen talk and an acceptance that such bullshit isn't so god damn cute anymore.
For further examples of such out of touch and stupid phrases, see Diablo Cody's shitty post-Juno writing credits (Jennifer's Body, Burlesque
et.al.)