ゲス野や郎ろう

also: げすやろう

Meanings

sleazebag; asshole; lowlife

derogatory

Strong derogatory insult for a contemptible, vulgar, or morally repulsive person. Rough and offensive; used mainly in casual, angry, or vulgar speech.

あのゲス野や郎ろう、また嘘うそつきやがった。
That sleazebag lied again.
ゲス野や郎ろうには関かかわりたくない。
I don't want anything to do with that lowlife.

Kanji

野plains, field, rustic
郎son, counter for sons
下below, down, descend
衆masses, great numbers, multitude
種species, kind, class

Related words

クズ
クズ is a common insult meaning 'scum' or 'trash', often used for worthless people. ゲス野郎 is more specifically about vulgar, sleazy behavior and carries a stronger tone of personal disgust.
野や郎ろう
野郎 alone is a rough, derogatory term for a man ('bastard', 'jerk'). ゲス野郎 intensifies it by adding ゲス (vulgar/low), making it a harsher insult.

Written forms

ゲス野や郎ろう
Most common spelling; uses katakana for ゲス.
下衆野郎げすやろう
Kanji form using 下衆; less common but still seen.
下種野郎げすやろう
Alternate kanji form; rare.
げすやろう

Etymology

Compound of ゲス (vulgar, low, sleazy) and 野郎 (rough term for a man). ゲス is often written in katakana in this compound; its origin is uncertain but may be related to 下衆 (げす, 'low-class person').