Noun
(UK, colloquial) A fool, a twit.
Now you've broken it, you twerp!
(US, colloquial, childish) A small or puny person; one regarded as insignificant, contemptible.
Get out of my way, you little twerp!
(US, colloquial, childish) A person who can be bullied playfully, or easily teased. Sometimes used as a pet-name (often for a younger sibling).
Source: en.wiktionary.orgA jumped-up little twerp [and a] prime candidate for exorcism. Conrad Black
Am I wrong to be an envious little twerp? Source: Internet
“Little twerp is not only a self centered delinquent, he’s a hypocrit to boot. Source: Internet