to write something carelessly and quickly

JOT DOWN: to quickly write down ideas, notes, or facts.

Let me jot down the name of that restaurant.

SCRAWL: to write something carelessly and untidily.

Three students were excluded for scrawling graffiti on a school wall.

SCRIBBLE: to write something quickly and untidily.

Andrew scribbled a quick note and handed it to the chairman.

DASH OFF: to write a letter, note, story etc quickly and without thinking carefully about it.

The publishers wanted a summary that afternoon, so I dashed it off in an hour or so.