ˌover-the-ˈtop adjective British English informal
(abbreviation OTT) remarks, behaviour etc that are over-the-top are so extreme or unreasonable that they seem stupid or offensive:
It’s a bit over-the-top to call him a fascist.

[TahlilGaran] Dictionary of Contemporary English ▲

over the top
too extreme.
To blame one person for the collapse of the business seems way over the top.

I listened to her speech, and some of her language was just over the top.

[TahlilGaran] English Idioms Dictionary ▲

over the top
to be excessive/overdone
The demands of our boss are over the top and everybody is becoming angry.

[TahlilGaran] English Idioms Dictionary ▲

over the top
adv. phr.
1. Out of the trenches and against the enemy.
The plan was to spend the night in the trenches and go over the top at dawn.
Johnny found that he was braver than he thought he would be when his company went over the top.
2. Over the goal.
Our goal was to collect a half million dollars for the new school building, but we went over the top.
Mary was asked to sell twenty tickets, and she went over the top.

[TahlilGaran] English Idioms Dictionary ▲