IMO: That means "In my opinion." A variation is IMHO ("In my humbled opinion")
These both annoy me, so much.
I think it's the caps, because I always read that as if the person were drawing out their words for effect.
The second one especially.
*In Myy Humble O
pinion*, people should just talk humbly if they are so humble.
[] and honestly if that is the case.