Definitions by Topdectoboss

Topdeck 

Widely used slang that cropped up recently in Australia
1. Something that is topnotch, excellent or above average.
2. Affirmative.

Marcus: "Bro that transmog set is sick"
Harry: "Yeah topdeck"

"Topdeck used to smash me mum"
-Trent from punchy

Topdeck by Topdectoboss September 2, 2013