What is the meaning of Capper?

A device or person that applies caps, as to bullets or bottles.

A person that makes or sells caps.

A finale; something that is conclusively better, or "caps it all off".

A by-bidder; a decoy for gamblers.

A person who records a television broadcast to their computer.

A person who caps i.e. is inclined to untruth, a fibber.

capper (maker of caps or other headgear)

Source: wiktionary.org