noun
brat; kid; urchin; little devil
Colloquial, often derogatory or affectionate term for a child, especially a mischievous or annoying one. Derived from 餓鬼 (がき, 'brat') with the suffix んちょ.
See also: ガキ
近所のガキンチョがうるさくてかなわない。
The neighborhood brats are so noisy I can't stand it.
That little devil has been up to mischief again.
Mixed katakana-hiragana spelling, also seen.
ガキ is a more common and slightly less childish-sounding slang for 'brat'; ガキンチョ is more emphatic and often used by adults to refer to children.
From 餓鬼 (がき, 'brat') + suffix んちょ, which adds a childish or derogatory nuance. The exact origin of んちょ is uncertain.