A euphemism for having sex that originated on the Facebook fan page: RIP Severus Snape; The Bravest Man I've Ever Known after an admin said he was slaying dragons with his admin girlfriend.
Blaise and Astoria were slaying dragons last night for five hours.
To kick ass. To dominate a particularfield. To be one of the greatest in that particular area.
She's slaying it. (She's doing extremely well)
He slayed that interview. (He did really well in the interview)
They're slaying the presentation. (They are doing well in the presentation, everyone is captivated by them)
I slayed it. (I won! I did excellent! I'm now memorable! My name's on everyone's lips! Who's awesome? Me!)