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The cherry on top. The insult added to injury. The final, amazing (or awful) finishing detail that caps the entire thing off.
"Here's the capper - I was sleeping with her sister!"
Capper by Q-Who January 14, 2014
Capper is a person who wont stop talking, or talking to you. The type of man who comes over and says 'speek inglsh preety laydee?' The type of girl who say 'Heather has put onnnnnnnn so muuuuuch weight dont you think, like, whateverrrrrr'. A fool.
David : Look, i can totally do an olly...or is a narlly..or..wait, just look at how much my jeans cost me..girls, over here! I can get really drunk on cheap ass beer aswell. Did I mention im,like, totally stoned right now? I hate the world and write bad poems about how much I want to cut myself. If i use my moms make up i can be cool as sheep aswell....

Hazel: Man, that guy is a total capper

Evelyn : I agree. Lets Laugh.

Hazel: Im up for that. 'Hahahahaha'

Evelyn: 'Hahahaha'
Capper by Hazel November 11, 2004
to flop your dick out. I made this word up because a famous Aussie footballer Warwick capper went on Celebrity Big Brother (Aussie edition) and flopped his dick out in front of two of the female celebs because and got kicked out of the house as a result.
When going to the toilet, you'd capper and piss.
capper by bread infection December 28, 2005
A capper broke into my car last night and took my GPS.
capper by liquidassnotice January 12, 2009
Derivation: night cap

When the bar is closing and you gather all your people together and head to one of their houses to keep drinking and mess the place up, that is a capper. Also known as an after-party.
Q: Hey man, where's the capper at?

A: I dunno man, I think Dave's, he's got booze.
capper by Gilmour93 February 25, 2009
(1) One who writes captions to screengrabs on the Scifi channel website.
(2) Anyone who writes captions to photos or screengrabs online.
(3) The elite of the MST3K fans.
Some legendary capers include gray zombie, glitterrock and jondapicam.
capper by jondapicam November 5, 2003