That man right there is a capper.
by Blxntslxt December 23, 2021

A capper is someone who lies constantly to his friends and family, someone like historical capper “Aidan A”
by TheurbangodLandon December 31, 2021

by NooniCapper Shay February 26, 2018

Humanity’s greatest failure, Capper is a slimy, disgusting freak of nature. The only thing more disgusting than his deformed kneecaps, is his blemished, repulsive face. He seems to think that he is the greatest human, however everyone laughs at his pathetic existence behind his back. Jesus did not die for inbred rats like capper.
Capper is a disgusting thing
by Moses Cool November 19, 2018

No capper noʊ ˈkæpər interjection (slang, emphatic). An intensified form of the slang interjection "no cap," used to emphatically assert the truthfulness or sincerity of a preceding or following statement. The addition of the "-er" suffix, typically associated with a hard "r" sound, serves to heighten the level of conviction being expressed.
by slangmandict April 20, 2025

A person who feels the need to constantly correct others, or prove their lies incorrect, also known as capping.
John was a big capper, barging into our conversation and disproving my friends story of him going fishing because that species didn't exist in the USA.
by Leonidas of Alexandria March 5, 2024
