I guess that's it
A word that can be used anywhere, anytime, and it always means the exact opposite of what you think it should mean. It’s the worst.
'I guess that's it' when he said he liked the movie, but he hated it.
'I guess that's it' when she said she didn’t care, but she actually did.
'I guess that's it' when he agreed to the plan, but he had no idea what was happening.