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.