meaning, it was meant to look accidental, but it was fully intentional for whatever reason, usually to manipulate some one or situation.
also used as, "not on purpose"
"I know he hated that vase my old boyfriend gave me, so he like dropped it and was all sorry about it and said his hands were wet, well you Know that was on purpose."
or just meh
a negative connotation, mixed with apathy and maybe disappointment, or Boredom and mild irritation.
Did you go look at the apartment? What didja think of it?
It's a good location and the grounds are spiff, but after seeing the garbled floorplan, I was like meh? For this much money, I'll go look at the other place.