Absolutely dominating

to take an unfortunate loss and turn of events.

performing at the highest level; ripping;

always looking fresh, somebody who is doing well.

"ate it", "fucked it", "pipped it", "finished it", "smashed it", or "Did a great job".

To put an unnecessary end to a good conversation by making a stupid comment.

The act of 'killing it' would be performed after a joke is being told when everyone has just got done laughing and 'the killer

tries to be funny and adds on to the joke in attempts of making it funnier. This of course is not funny, and in turn, 'the killer' was just a big buzzkill, otherwise known as 'killing it'