clap up
clap together
slap together

The report gave Ryan the impression of having been slapped together.

The café looked as if it had been slapped together over a weekend.

I shoved myself down hard and fast until the sound of our bodies hitting slapped together.

The pieces of dough are then slapped together into a circular shape.

Or when it does, it's sort of slapped together.

At no point in the album does it fall off and become about some songs I slapped together.

Then-- There was a sound like two lead doors being slapped together, with the ship between them.

But in other scenes, the movie feels underwritten and slapped together.

You have the sense things can fly apart so easily; it's all slapped together, improvised.