thump out

Related to thump out: thump down

thump out

1. To create some kind of rhythm, tune, or percussive beat by thumping (on something). A noun or pronoun can be used between "thump" and "out." Someone started thumping out a beat on an upturned bucket while Jeff improvised the words. I couldn't remember how the song went, so she thumped the rhythm out for me on the table.
2. To play a song (on some instrument with keys), especially in a very rough or informal manner. Someone ran over to the piano and started thumping out "Jingle Bells."
See also: out, thump
Farlex Dictionary of Idioms.

thump something out (on the piano)

to pound out music on a piano. Joel thumped a happy tune out on the piano. He thumped out a well-known tune.
See also: out, thump
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • not do (someone or oneself) any favors
  • ask back
  • (Is) this taken?
  • angle
  • angling
  • interpret for
  • interpret for (someone)
  • rescue from
  • rescue from (someone or something)
  • identify with