Consecutively double faulting three or more times during a game of tennis. May also refer to a number of variants all involving failure during a game of doubles specifically - repeatedly slamming easy balls into the net, awkwardly jumping in the way of a team mates ball and instigating an uncoordinated unforced error, missing the ball entirely, or performing a poor man's version of the Van Damme splits while sliding and then holding the general lower back region.

This is accompanied by profuse swearing (usually in the form of an f-bomb), complaining, and/or blaming inanimate objects and non-existant environmental factors such as 'the wind'. These factors (and others such as breaking things and wiring things up wrong) inherently exist regardless of whether there is a tennis game going on, yet they are an essential component to truly Kaspering something.
(After someone unnecessarily jumps in, and rather poorly, does something that you had covered and were all over): "Wow, you sure Kaspered that one!"

Person 1: "Dude, the server's not working."
Person 2: "Yeah, it's been Kaspered".

(After someone excessively complains about something, for example, complaining the whole way while running 10km): "You sir, are the Kasper of running".
by coneman March 25, 2013
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kasper is kasper
Kasper: i am kasper
other person: wow you're kasper
by sexymaster58 September 14, 2020
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It means to be 'Awesome','Cool', or a 'Legend'.
" Matey, i scored so badly yesterday, it was amazing !! "

"Dude! Your so Kasper!"
by matey4lyf July 20, 2009
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Pulling a Kasper refers to a sort of dance, mid dance floor. You make this dance by sticking out your pelvis and by putting both hands on your hips you try and look as drunk as you can, sometimes even making this manuever with a full cockatil in your one of your hands. Thus trying to attrack members of the opposite sex for a "one night stand". This dance has a high rate of success.
If it gets late enough I might have to just sack up and make a kasper on the dancefloor.
by Poonluvr March 4, 2008
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the one and only god of fortnite
Never flexes but has more than 1000 wins
Never loses and is always helping bots and meme-ing
Just imagine a TTV and a memer in one
Kasper: Yeet!
Everyone in the fortnite lobby: *dies*
by Mahtais September 23, 2019
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He’s the boy you all dream about! He’s just too perfect, everybody needs a Kasper in their life. When you start to like him, there’s no turning back!!
«Do you like kasper

«Of course i do, who don’t?»
by Bente Knudsen December 31, 2019
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