word usage - Is it correct to say "I slump/slumped on/onto the stool/barstool?"

I wrote this sentence: "I buy a bottle of beer and slump on/onto the last stool."

A native English speaker told me that "slump" doesn't work here. That you can't slump on a bar/barstool.

Is this correct? If so, why?

Answer

Your use of slump is fine and fits with the definition of the verb form.