from The Century Dictionary.
- noun A rogue; one given to mischievous tricks.
from Wiktionary, Creative Commons Attribution/Share-Alike License
"Come oot o 'the gutter, ye nickum!" cried, in harsh, half-masculine voice, a woman standing on the curbstone of a short, narrow, dirty lane, at right angles to an important thoroughfare, itself none of the widest or cleanest.
I wonner that ye tak sic pains wi 'me, sir, whan I was sic a nickum. "