I keep seeing tweets that start off “OH:” on Twitter. Are all these tweets about the great state of Ohio, or is there something else going on?
–Confused in Columbus
OH is shorthand for “Overheard.” When you overhear something funny, or want to protect the privacy of a friend, you “OH it.” It's often things heard out of context, that seem funny at the time, as in, “OH: Smell my teabag.“
Sounds dirty, but actually there was an interesting smelling teabag in question.